{"title":"Rectifier Tubes","description":"","products":[{"product_id":"6x4-ez90-gm-delco-black-plates-getter-tube-rectifier-made-in-usa","title":"6X4 ( EZ90 ) GM DELCO Black Plates [] Getter Tube Rectifier Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X4 ( EZ90 ) GM DELCO Black Plates [] Getter Tube Rectifier\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003e \u003cspan\u003eVoltage Test: Va 60V; Vf 6.3V\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eAverage 100%: Ia = 42 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eSection 1:\u003c\/span\u003e \u003cspan\u003eIa = 45 mA\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eSection 2:\u003c\/span\u003e \u003cspan\u003eIa = 46 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e GAS Test\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"GENERAL MOTORS","offers":[{"title":"Default Title","offer_id":42983596425463,"sku":"00671","price":14.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/6x4-ez90-gm-delco-black-plates-getter-tube-rectifier-made-in-usa-429427.jpg?v=1657112752"},{"product_id":"6ca4-ez81-ge-nos-nib-gray-plates-o-getter-rectifier-tube-made-in-usa","title":"6CA4 ( EZ81 ) GE NOS NIB Copper Plates Halo Getter Rectifier Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003e\u003cstrong\u003e6CA4 (EZ81) GE NOS NIB Copper Plates Halo Getter Rectifier Tube\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003e\"Copper Plates\"\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eTubes tested on Funke W19 Tube tester:\u003cbr\u003e Voltage Test: Va = 60V, Vf = 6.3V\u003cbr\u003e Average 100%: Ia = 74\u003c\/span\u003e \u003cspan\u003emA\u003cbr\u003e Good from: Ia 48 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003ePlate current\u003cbr\u003e Section 1: Ia = 77 mA\u003cbr\u003e Section 2: Ia = 82 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eFurther tests performed:\u003cbr\u003e Microphone Test\u003cbr\u003e Emission Quality\u003cbr\u003e Short Circuit Test\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eGAS Test\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003ca rel=\"noopener\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":42984064057591,"sku":"00622","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/6ca4-ez81-ge-nos-nib-gray-plates-o-getter-rectifier-tube-made-in-usa-879954.jpg?v=1657112768"},{"product_id":"80-st-tung-sol-type-80-nos-black-plates-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) TUNG-SOL NOS Black Plates [] Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) TUNG-SOL NOS Black Plates [] Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base is narrow, there are no loose particles inside the tube.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;90 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 100 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003c\/p\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":43230397137143,"sku":"00864","price":34.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-tung-sol-nos-black-plates-getter-rectifier-tube-made-in-usa-567686.jpg?v=1662578672"},{"product_id":"80-110e-59-rca-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) RCA Black Plates Foil Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) RCA Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base\u0026nbsp;is narrow, there are no loose particles inside the tube, old school style \"leaf\" g\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eetter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;75 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 78 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43230548164855,"sku":"00865","price":34.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-rca-black-plates-foil-getter-rectifier-tube-made-in-usa-917918.jpg?v=1662578658"},{"product_id":"80-110e-59-ken-rad-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base is narrow, there are no free particles inside the tube.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\"Filament hooked\" construction for extremely low background noise and getter\" \"leaf\" old school style.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;83 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 83 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"KEN-RAD","offers":[{"title":"Default Title","offer_id":43231360549111,"sku":"00866","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-ken-rad-black-plates-foil-getter-rectifier-tube-made-in-usa-486075.jpg?v=1662578653"},{"product_id":"80-110e-59-ken-rad-black-plates-foil-getter-rectifier-tube-made-in-usa-1","title":"80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base is narrow, there are no free particles inside the tube.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\"Suspended filaments\" construction for extremely low background noise and getter\" \"leaf\" old school style.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;85 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 90 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"KEN-RAD","offers":[{"title":"Default Title","offer_id":43231404720375,"sku":"00867","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-ken-rad-black-plates-foil-getter-rectifier-tube-made-in-usa-702133.jpg?v=1662578653"},{"product_id":"80-110e-59-ge-black-plates-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) GE NOS Black Plates [] Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) GE NOS Black Plates [] Getter Rectifier Tube Made in USA\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;108 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 110 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":43234282078455,"sku":"00872","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-ge-nos-black-plates-getter-rectifier-tube-made-in-usa-466889.jpg?v=1662677339"},{"product_id":"80-110e-59-ken-rad-black-plates-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) KEN-RAD Black Plates [] Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base is narrow, there are no free particles inside the tube.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\"Suspended filaments\" construction for extremely low background noise and getter\" \"leaf\" old school style.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: STRONG \/ VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 87 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"KEN-RAD","offers":[{"title":"Default Title","offer_id":43234334966007,"sku":"00873","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/80-110e59-ken-rad-black-plates-getter-rectifier-tube-made-in-usa-436614.jpg?v=1662677336"},{"product_id":"5z3-vt-145-cbs-black-plates-top-side-getter-tube-rectifier-made-in-usa-60","title":"5Z3 ( VT-145 ) RCA Black Plates Top Side [] Getter Matched Pair Tubes Rectifiers Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5Z3 ( VT-145 ) RCA Black Plates Top Side [] Getter Matched Pair Tubes Rectifiers\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eElectrically identical to the 5U4G with different pinout.\u003c\/span\u003e\u003cbr\u003eCan be used to replace the 5U4G using our \u003ca href=\"https:\/\/vacuumtubestreasures.com\/products\/5z3-80-to-gz34-5ar4-5u4-adapters-converters?utm_source=copyToPasteBoard\u0026amp;utm_medium=product-links\u0026amp;utm_content=web\" title=\"5Z3 - 80 TO GZ34 - 5AR4 - 5U4 ADAPTERS CONVERTERS\"\u003eadapter\u003c\/a\u003e:\u0026nbsp;\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTubes tested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eGood from: Ia = 78 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100%\u0026nbsp;Ia =\u0026nbsp;120 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003e\u003cspan\u003eSection 1: Ia = 136mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: Ia = 136 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 2:\u003cbr\u003eSection 1: Ia = 135 mA\u003cbr\u003eSection 2: Ia = 135 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003cbr\u003eOperation: Stable tube, silent in operation and suitable for providing a regular and well-controlled power supply. Tested with Funke W19 tube tester.\u003cbr\u003eEmission Quality\u003cbr\u003eTest for Short Circuits\u003cbr\u003eTest for GAS\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43240697168119,"sku":"00881","price":109.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/11a.jpg?v=1713172933"},{"product_id":"5r4gyb-5r4gy-sylvania-black-plates-side-o-getter-matched-tube-rectifier-made-in-usa","title":"5R4GYB ( 5R4GY ) NOS GE Black Plates Side Halo Getter Tested Tube Rectifier Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5R4GYB ( 5R4GY ) NOS GE Black Plates Side Halo Getter\u0026nbsp;Tested Tube Rectifier\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u0026nbsp;\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduced by SYLVANIA U.S.A. for General Electric \u003cmeta charset=\"utf-8\"\u003eU.S.A.\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eLabeled for General Electric\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eU.S.A.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis 5R4GY rectifier tube has the build quality and reliability of Made in the USA products. Rigorously selected and \u003cmeta charset=\"utf-8\"\u003emanufactured by Sylvania and labeled for\u0026nbsp;GE, this tube has been tested to ensure the highest quality. Choose it for your grinding needs if you are looking for a superior quality product.\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Good from: Ia = 61 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Ia = 95 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;122 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;132 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Further tests performed:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eMicrophony Test\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eEmission Quality\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003e\u003cspan data-mce-fragment=\"1\"\u003eTest For GAS\u003c\/span\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":43397126455543,"sku":"00932T","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/5_7716e280-8d74-4859-a715-d99bb559f553.jpg?v=1684687163"},{"product_id":"12x4-rca-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57","title":"12X4 RCA NOS Black Plates Square Getter Tube Rectifier Made in USA '57","description":"\u003cp\u003e\u003cstrong\u003e12X4 RCA NOS Black Plates Square Getter Tube Rectifier\u003c\/strong\u003e \u003cstrong\u003eMade in USA '57\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"514\" data-start=\"141\"\u003eThe RCA 12X4, produced in the United States in 1957, is a miniature rectifier designed for reliability and quiet operation. This NOS version with black plates and a square getter is one of the most sought-after variants of the series, thanks to its robust construction and ability to provide a stable, linear power supply.\u003c\/p\u003e\n\u003cp data-end=\"546\" data-start=\"516\"\u003e\u003cstrong data-end=\"544\" data-start=\"518\"\u003eSound characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"613\" data-start=\"549\"\u003e\u003cstrong data-end=\"558\" data-start=\"549\"\u003eBass\u003c\/strong\u003e : tight and dry, with excellent control and precision.\u003c\/li\u003e\n\u003cli data-end=\"708\" data-start=\"616\"\u003e\u003cstrong data-end=\"624\" data-start=\"616\"\u003eMedium\u003c\/strong\u003e : balanced and natural, with a clear rendering and free from unwanted colorations.\u003c\/li\u003e\n\u003cli data-end=\"785\" data-start=\"711\"\u003e\u003cstrong data-end=\"719\" data-start=\"711\"\u003eHighs\u003c\/strong\u003e : clear and well extended, with elegant and never aggressive detail.\u003c\/li\u003e\n\u003cli data-end=\"886\" data-start=\"788\"\u003e\u003cstrong data-end=\"800\" data-start=\"788\"\u003eDynamics\u003c\/strong\u003e : fast and coherent, capable of ensuring continuity even in complex passages.\u003c\/li\u003e\n\u003cli data-end=\"978\" data-start=\"889\"\u003e\u003cstrong data-end=\"903\" data-start=\"889\"\u003eSoundstage\u003c\/strong\u003e : Clean and focused, with a stable soundstage and low background noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1190\" data-start=\"980\"\u003e🎧 \u003cstrong data-end=\"999\" data-start=\"983\"\u003eHi-Fi use\u003c\/strong\u003e\u003cbr data-end=\"1002\" data-start=\"999\"\u003ePerfect as a rectifier for preamplifiers, tuners and vintage hi-fi equipment, the 12X4 RCA guarantees a linear and silent power supply, improving the overall sound output.\u003c\/p\u003e\n\u003cp data-end=\"1384\" data-start=\"1192\"\u003e🎸 \u003cstrong data-end=\"1227\" data-start=\"1195\"\u003eUse in Music Applications\u003c\/strong\u003e\u003cbr data-end=\"1230\" data-start=\"1227\"\u003eAlso suitable for instrument amplifiers, it provides a stable power supply that contributes to a warm, balanced sound with harmonic naturalness.\u003c\/p\u003e\n\u003cp data-end=\"1713\" data-start=\"1386\"\u003e🎯 \u003cstrong data-end=\"1427\" data-start=\"1389\"\u003eNote for audiophiles and collectors\u003c\/strong\u003e \u003cbr data-end=\"1430\" data-start=\"1427\"\u003eThe NOS 1957 RCA Black Plates Square Getter 12X4 is a premium and robust version, highly regarded for its ability to combine technical reliability and sound quality. An authentic piece for those who wish to preserve the original character of vintage American equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia =\u003cmeta charset=\"utf-8\"\u003e 42 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 46 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 47 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Excellent – Excellently preserved lettering, minimal signs of wear. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e57 - 17 - Produced in the 17th week of 1957\u003c\/span\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43469405520119,"sku":"00955","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12x4-rca-at-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57-972829.jpg?v=1665926899"},{"product_id":"12x4-rca-test-nos-black-plates-getter-tube-rectifier-made-in-usa-58","title":"12X4 RCA NOS Black Plates Square Getter Tube Rectifier Made in USA '57","description":"\u003cp\u003e\u003cstrong\u003e12X4 RCA NOS Black Plates Square Getter Tube Rectifier\u003c\/strong\u003e \u003cstrong\u003eMade in USA '57\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"514\" data-start=\"141\"\u003eThe RCA 12X4, produced in the United States in 1957, is a miniature rectifier designed for reliability and quiet operation. This NOS version with black plates and a square getter is one of the most sought-after variants of the series, thanks to its robust construction and ability to provide a stable, linear power supply.\u003c\/p\u003e\n\u003cp data-end=\"546\" data-start=\"516\"\u003e\u003cstrong data-end=\"544\" data-start=\"518\"\u003eSound characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"613\" data-start=\"549\"\u003e\u003cstrong data-end=\"558\" data-start=\"549\"\u003eBass\u003c\/strong\u003e : tight and dry, with excellent control and precision.\u003c\/li\u003e\n\u003cli data-end=\"708\" data-start=\"616\"\u003e\u003cstrong data-end=\"624\" data-start=\"616\"\u003eMedium\u003c\/strong\u003e : balanced and natural, with a clear rendering and free from unwanted colorations.\u003c\/li\u003e\n\u003cli data-end=\"785\" data-start=\"711\"\u003e\u003cstrong data-end=\"719\" data-start=\"711\"\u003eHighs\u003c\/strong\u003e : clear and well extended, with elegant and never aggressive detail.\u003c\/li\u003e\n\u003cli data-end=\"886\" data-start=\"788\"\u003e\u003cstrong data-end=\"800\" data-start=\"788\"\u003eDynamics\u003c\/strong\u003e : fast and coherent, capable of ensuring continuity even in complex passages.\u003c\/li\u003e\n\u003cli data-end=\"978\" data-start=\"889\"\u003e\u003cstrong data-end=\"903\" data-start=\"889\"\u003eSoundstage\u003c\/strong\u003e : Clean and focused, with a stable soundstage and low background noise.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1190\" data-start=\"980\"\u003e🎧 \u003cstrong data-end=\"999\" data-start=\"983\"\u003eHi-Fi use\u003c\/strong\u003e\u003cbr data-end=\"1002\" data-start=\"999\"\u003ePerfect as a rectifier for preamplifiers, tuners and vintage hi-fi equipment, the 12X4 RCA guarantees a linear and silent power supply, improving the overall sound output.\u003c\/p\u003e\n\u003cp data-end=\"1384\" data-start=\"1192\"\u003e🎸 \u003cstrong data-end=\"1227\" data-start=\"1195\"\u003eUse in Music Applications\u003c\/strong\u003e\u003cbr data-end=\"1230\" data-start=\"1227\"\u003eAlso suitable for instrument amplifiers, it provides a stable power supply that contributes to a warm, balanced sound with harmonic naturalness.\u003c\/p\u003e\n\u003cp data-end=\"1713\" data-start=\"1386\"\u003e🎯 \u003cstrong data-end=\"1427\" data-start=\"1389\"\u003eNote for audiophiles and collectors\u003c\/strong\u003e \u003cbr data-end=\"1430\" data-start=\"1427\"\u003eThe NOS 1957 RCA Black Plates Square Getter 12X4 is a premium and robust version, highly regarded for its ability to combine technical reliability and sound quality. An authentic piece for those who wish to preserve the original character of vintage American equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia =\u003cmeta charset=\"utf-8\"\u003e 42 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 47 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 45 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Very\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Excellent – Excellently preserved lettering, minimal signs of wear. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e57 - ?? - Produced the ?? week of 1957\u003c\/span\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43470148370679,"sku":"00956","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12x4-rca-at-test-nos-black-plates-getter-tube-rectifier-made-in-usa-57-338501.jpg?v=1665970256"},{"product_id":"6x5gt-6z5p-sylvania-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"6X5 GT ( 6Z5P ) SYLVANIA Black Plates Foil Getter Rectifier Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X5GT ( 6Z5P ) SYLVANIA Black Plates Foil Getter Rectifier Tube \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 60V, Vf = 6.3V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100%:\u0026nbsp; Ia =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;53 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eFurther tests performed:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eMicrophony Test\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eEmission Quality\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eShort Circuit Test\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":43673312821495,"sku":"01077","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/6x5gt-6z5p-sylvania-black-plates-foil-getter-rectifier-tube-made-in-usa-896411.jpg?v=1672090453"},{"product_id":"5y3gt-5y3gt-g-zenith-black-plates-foil-getter-tube-rectifier-made-in-usa","title":"5Y3GT ( 5Z2P ) ZENITH Black Plates Foil Getter Tube Rectifier Made in USA","description":"\u003cp\u003e\u003cstrong\u003e5Y3GT ( 5Z2P ) ZENITH Black Plates Foil Getter Tube Rectifier Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s1\"\u003e\u003cb\u003e5Y3GT (5Z2P) ZENITH by RCA\u003c\/b\u003e\u003c\/span\u003e is an American-made full-wave rectifier, most likely attributable to the \u003cspan class=\"s1\"\u003e\u003cb\u003eRCA\u003c\/b\u003e\u003c\/span\u003e factory, as suggested by the construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003efoil getter\u003c\/b\u003e\u003c\/span\u003e , typical of high-level RCA productions of the period.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The exact chronological placement is likely \u003cspan class=\"s1\"\u003e\u003cb\u003ethe late 1940s\u003c\/b\u003e\u003c\/span\u003e , even if, in the absence of fully legible manufacturing codes, we prefer to maintain a prudent and historically correct position.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThe tube was tested in our laboratory with \u003cspan class=\"s1\"\u003e\u003cb\u003eFunke W19\u003c\/b\u003e\u003c\/span\u003e , proving to \u003cspan class=\"s1\"\u003e\u003cb\u003ebe NOS-like\u003c\/b\u003e\u003c\/span\u003e , with excellent electrical behavior, very high output, and full operational stability. A rectifier of great appeal, both for use and for collection.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSound Characteristics\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The 5Y3GT RCA-style is appreciated for its balanced and musical sonic contribution, capable of positively influencing the overall character of the amplifier, especially in single-ended and vintage-inspired circuits.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Smooth yet well-controlled, with a rounded, natural response. The low range is full and coherent, without excess, ideal for systems that prioritize musicality and fluidity.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eMids:\u003c\/b\u003e Warm, present, and very natural. Vocals acquire body and three-dimensionality, with a typically \"American\" vintage delivery, rich but never artificial.\u003c\/p\u003e\n\n \u003cp class=\"p3\"\u003e\u003cb\u003eHighs:\u003c\/b\u003e Smooth and well-integrated, free of harshness. The highs are elegant and relaxing, making for a long and satisfying listen.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eDynamics:\u003c\/b\u003e Progressive and fluid. The transient response is not aggressive, but well-controlled, promoting a sense of continuity and musical naturalness.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Stable and coherent soundstage, with good depth and believable instrument placement. The presentation is organic and well-proportioned.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003e🎧 Hi-Fi\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e Ideal for vintage hi-fi amplifiers, single-ended amplifiers, and projects inspired by classic American electronics. Particularly suitable for those seeking a warm, musical, and authentic sound.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003e🎸 Musical\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e It is also highly appreciated in instrument amplifiers, where it contributes to a softer response, with natural compression and great tonal pleasure.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003e🎯 Audiophile note\u003c\/b\u003e\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e5Y3GT ZENITH by RCA\u003c\/b\u003e\u003c\/span\u003e combines historic charm, vintage construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates and foil getters\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS-like\u003c\/b\u003e\u003c\/span\u003e electrical performance, verified on \u003cspan class=\"s1\"\u003e\u003cb\u003eFunke W19\u003c\/b\u003e\u003c\/span\u003e .\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e A rectifier with authentic character, perfect for those who want the sound and reliability of the great post-war American productions, without compromise and without alarmism, but with real sonic and collectible value.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e Valve tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eFunke W19\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 77.5 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 80 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 79 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n \u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Standard. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eConditions:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVintage Tubes - Tested and in perfect working order. Comes in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExcellent – ​​Perfectly preserved writing, minimal signs of wear. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable, identifiable by construction features. Late 1940s.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZENITH","offers":[{"title":"Default Title","offer_id":43694562312439,"sku":"01099","price":89.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_ea8fed92-c26b-4d29-a554-d553d10cd983.jpg?v=1769184763"},{"product_id":"5y3g-5y3gt-g-tung-sol-nos-black-ribbed-plates-foil-getter-tube-rectifier-made-in-usa","title":"5Y3G 5Z2P TUNG-SOL NOS Hanging Filaments Black Ribbed Plates Foil Getter Tube Rectifier Made in USA '50s","description":"\u003cp\u003e\u003cstrong\u003e5Y3G ( 5Z2P ) TUNG-SOL NOS Hanging Filaments Black Ribbed Plates Foil Getter Tube Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"557\" data-start=\"238\"\u003eThe \u003cstrong data-end=\"265\" data-start=\"241\"\u003e5Y3G \/ 5Z2P TUNG-SOL\u003c\/strong\u003e , in this rare \u003cstrong data-end=\"307\" data-start=\"291\"\u003eNOS 1950s\u003c\/strong\u003e version with \u003cstrong data-end=\"340\" data-start=\"322\"\u003eST bottle\u003c\/strong\u003e structure, \u003cstrong data-end=\"363\" data-start=\"342\"\u003esuspended filaments\u003c\/strong\u003e , \u003cstrong data-end=\"389\" data-start=\"365\"\u003eribbed black plates\u003c\/strong\u003e and \u003cstrong data-end=\"424\" data-start=\"392\"\u003edisc getter (foil getter)\u003c\/strong\u003e , represents one of the most refined and stable rectifiers produced in the United States in the first half of the post-war period.\u003c\/p\u003e\n\u003cp data-end=\"902\" data-start=\"559\"\u003eThe presence of \u003cstrong data-end=\"596\" data-start=\"575\"\u003esuspended filaments\u003c\/strong\u003e – a distinctive construction feature of TUNG-SOL – contributes to improved \u003cstrong data-end=\"699\" data-start=\"679\"\u003ethermal management\u003c\/strong\u003e and a \u003cstrong data-end=\"751\" data-start=\"708\"\u003ereduction in microphonic vibrations\u003c\/strong\u003e , making it a \u003cstrong data-end=\"821\" data-start=\"776\"\u003esilent, durable and musically cohesive\u003c\/strong\u003e valve, perfect for sensitive hi-fi applications or restorations of historic audio systems.\u003c\/p\u003e\n\u003cp data-end=\"1150\" data-start=\"909\"\u003e\u003cstrong data-end=\"918\" data-start=\"909\"\u003eBass\u003c\/strong\u003e : Smooth and articulated. The low end is \u003cstrong data-end=\"985\" data-start=\"959\"\u003erelaxed but readable\u003c\/strong\u003e , with a response free from harshness that helps \u003cstrong data-end=\"1058\" data-start=\"1036\"\u003ethe overall harmony\u003c\/strong\u003e of the system. Less incisive than a GZ34, but more controlled than some older 5Y3s.\u003c\/p\u003e\n\u003cp data-end=\"1412\" data-start=\"1152\"\u003e\u003cstrong data-end=\"1160\" data-start=\"1152\"\u003eMids\u003c\/strong\u003e : natural and airy. The mid frequencies are \u003cstrong data-end=\"1224\" data-start=\"1205\"\u003efluid and sober\u003c\/strong\u003e , with an \u003cstrong data-end=\"1260\" data-start=\"1239\"\u003ealmost transparent\u003c\/strong\u003e rendering that does not color the signal but accompanies it with grace. The voices appear \u003cstrong data-end=\"1344\" data-start=\"1332\"\u003ecentered\u003c\/strong\u003e , \u003cstrong data-end=\"1363\" data-start=\"1346\"\u003eintelligible\u003c\/strong\u003e and endowed with a particular \u003cstrong data-end=\"1411\" data-start=\"1392\"\u003eethereal presence\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"1659\" data-start=\"1414\"\u003e\u003cstrong data-end=\"1422\" data-start=\"1414\"\u003eHighs\u003c\/strong\u003e : smooth and unobtrusive. The high end of the spectrum is \u003cstrong data-end=\"1511\" data-start=\"1485\"\u003epleasantly rounded\u003c\/strong\u003e , without loss of information. Fine detail is returned with \u003cstrong data-end=\"1606\" data-start=\"1583\"\u003etact and discretion\u003c\/strong\u003e , allowing for prolonged listening without fatigue.\u003c\/p\u003e\n\u003cp data-end=\"1903\" data-start=\"1661\"\u003e\u003cstrong data-end=\"1673\" data-start=\"1661\"\u003eDynamics\u003c\/strong\u003e : progressive and velvety. The dynamic response is \u003cstrong data-end=\"1744\" data-start=\"1723\"\u003esweet but coherent\u003c\/strong\u003e , with a feeling of \u003cstrong data-end=\"1789\" data-start=\"1768\"\u003econtinuous fluidity\u003c\/strong\u003e rather than immediate attack. Excellent in single-ended systems, where you are looking for musicality rather than incisiveness.\u003c\/p\u003e\n\u003cp data-end=\"2191\" data-start=\"1905\"\u003e\u003cstrong data-end=\"1919\" data-start=\"1905\"\u003eSoundstage\u003c\/strong\u003e : intimate but tidy. The soundstage is \u003cstrong data-end=\"1987\" data-start=\"1959\"\u003emore compact than expansive\u003c\/strong\u003e , but offers \u003cstrong data-end=\"2032\" data-start=\"1998\"\u003edepth and spatial coherence\u003c\/strong\u003e , with a well-defined separation of the planes. The positioning of the instruments is \u003cstrong data-end=\"2144\" data-start=\"2120\"\u003ecredible and natural\u003c\/strong\u003e , especially in acoustic or vocal contexts.\u003c\/p\u003e\n\u003cp data-end=\"2673\" data-start=\"2198\"\u003e🎧 \u003cstrong data-end=\"2258\" data-start=\"2201\"\u003eUse in Headphone Amplifiers and Driver Stages Hi-Fi\u003c\/strong\u003e \u003cbr data-end=\"2261\" data-start=\"2258\"\u003eThe 5Y3G TUNG-SOL, thanks to its suspended filament construction and \u003cstrong data-end=\"2360\" data-start=\"2336\"\u003eextreme silence\u003c\/strong\u003e , is perfect for \u003cstrong data-end=\"2397\" data-start=\"2377\"\u003epreamplifiers\u003c\/strong\u003e , \u003cstrong data-end=\"2416\" data-start=\"2399\"\u003etube DACs\u003c\/strong\u003e , \u003cstrong data-end=\"2436\" data-start=\"2418\"\u003eline stages\u003c\/strong\u003e and high-efficiency \u003cstrong data-end=\"2467\" data-start=\"2439\"\u003eheadphone amplifiers\u003c\/strong\u003e . It offers a \u003cstrong data-end=\"2548\" data-start=\"2515\"\u003estable and musically neutral\u003c\/strong\u003e voltage base, enhancing microdynamics and detail on reference headphones such as \u003cstrong data-end=\"2629\" data-start=\"2614\"\u003ethe ZMF Caldera\u003c\/strong\u003e , \u003cstrong data-end=\"2649\" data-start=\"2631\"\u003eFocal Clear MG\u003c\/strong\u003e or \u003cstrong data-end=\"2672\" data-start=\"2652\"\u003eSennheiser HD600\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"3044\" data-start=\"2675\"\u003e🎸 \u003cstrong data-end=\"2723\" data-start=\"2678\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e \u003cbr data-end=\"2726\" data-start=\"2723\"\u003eThis tube was an original choice for \u003cstrong data-end=\"2808\" data-start=\"2776\"\u003elow-power Fender Tweed\u003c\/strong\u003e amps, and delivers \u003cstrong data-end=\"2866\" data-start=\"2827\"\u003edeep, controlled sag\u003c\/strong\u003e , with \u003cstrong data-end=\"2929\" data-start=\"2894\"\u003erounded dynamic response and natural compression\u003c\/strong\u003e ideal for jazz, primal rock 'n' roll and clean blues. Great in single-ended or studio push-pull circuits.\u003c\/p\u003e\n\u003cp data-end=\"3431\" data-start=\"3046\"\u003e🎯 \u003cstrong data-end=\"3081\" data-start=\"3049\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr data-end=\"3084\" data-start=\"3081\"\u003eA \u003cstrong data-end=\"3127\" data-start=\"3103\"\u003edelicate and refined\u003c\/strong\u003e rectifier, combining \u003cstrong data-end=\"3181\" data-start=\"3140\"\u003ehigh-level mechanical construction\u003c\/strong\u003e and \u003cstrong data-end=\"3211\" data-start=\"3184\"\u003ea classy musical voice\u003c\/strong\u003e . The \u003cstrong data-end=\"3254\" data-start=\"3225\"\u003eNOS version with suspended filaments\u003c\/strong\u003e and disk getter represents an excellent choice for those looking for \u003cstrong data-end=\"3370\" data-start=\"3320\"\u003etonal coherence, silence and long life\u003c\/strong\u003e , both in author projects and in valuable vintage restorations.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 77.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 69 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 70 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e Excellent – Inscriptions very well preserved, minimal signs of aging. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable code. Manufacturing year detected by internal structure. Manufacturing 1950s.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":43761199251703,"sku":"01184U","price":59.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/8_54a945e6-7bfc-46d7-9e1a-4c2d5402c97b.jpg?v=1769185442"},{"product_id":"80-110e-59-philco-black-plates-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) PHILCO Black Plates [] Getter Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) PHILCO Black Plates [] Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base is narrow, there are no loose particles inside the tube.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eValves tested on Funke W19 Tube tester: \u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result :\u0026nbsp; VERY LOUD\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;82 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 78 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003c\/p\u003e","brand":"PHILCO","offers":[{"title":"Default Title","offer_id":43766711189751,"sku":"01199U","price":34.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_2a20bf3d-49ce-4d84-aa68-7ede34c2e711.jpg?v=1677515382"},{"product_id":"80-110e-59-rca-cunningham-radiotron-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) RCA Cunningham RADIOTRON Black Plates Hanging Filaments Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) RCA Cunningham RADIOTRON Black Plates Foil Getter Hanging Filaments Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base\u0026nbsp;is narrow, there are no loose particles inside the tube, old school style \"leaf\" g\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eetter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersion with Attached Filaments\u0026nbsp;Low Noise\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;70 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 70 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43766725509367,"sku":"01200U","price":34.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_82b3ca30-d849-42e2-887f-9b366d52932b.jpg?v=1677517063"},{"product_id":"80-110e-59-ken-rad-black-plates-hanging-filaments-rectifier-tube-made-in-usa","title":"80 ( VT-80 ) KEN-RAD Black Plates Hanging Filaments Rectifier Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e80 ( VT-80 ) KEN-RAD Black Plates Foil Getter Hanging Filaments Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe base\u0026nbsp;is narrow, there are no loose particles inside the tube, old school style \"leaf\" g\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eetter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersion with Attached Filaments\u0026nbsp;Low Noise\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e Average 100% Ia = 92 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003ePlate current\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa =\u0026nbsp;72 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eIa = 75 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"KEN-RAD","offers":[{"title":"Default Title","offer_id":43767860560119,"sku":"01201T","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_e2cbcf2b-8b2e-42c1-8755-be35bb804753.jpg?v=1677600170"},{"product_id":"6x4-ez90-rca-rectifier-made-1950s-with-dimple-d-square-getter-for-audio-note","title":"6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED GETTER for AUDIO NOTE","description":"\u003cp\u003e\u003cstrong\u003e6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED\u0026nbsp;GETTER for AUDIO NOTE\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfterMarket BOX\u003cbr\u003eLogo worn as in the photo\u003c\/p\u003e\n\u003cp\u003eThe offer is for a rectifier valve\u003cbr\u003eTested on Funke W19 Tube tester:\u003cbr\u003eOur instruments are calibrated with reference tubes.\u003cbr\u003eVa 60V; Vf 6.3V\u003cbr\u003eAverage 100%: Ia = 42 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlate current\u003cbr\u003eSection 1: Ia = 48 mA\u003cbr\u003eSection 2: Ia = 46 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eTest for Short Circuits\u003cbr\u003eEmission Quality\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":46419886965084,"sku":"01257","price":49.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_6e784666-dc55-4fd2-8208-0d465c866d6b.jpg?v=1679511884"},{"product_id":"6x4-ez90-nos-rca-rectifier-made-1950s-with-dimple-d-square-getter-for-audio-note","title":"6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED GETTER for AUDIO NOTE","description":"\u003cp\u003e\u003cstrong\u003e6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED\u0026nbsp;GETTER for AUDIO NOTE\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfterMarket BOX\u003cbr\u003eLogo worn as in the photo\u003c\/p\u003e\n\u003cp\u003eThe offer is for a rectifier valve\u003cbr\u003eTested on Funke W19 Tube tester:\u003cbr\u003eOur instruments are calibrated with reference tubes.\u003cbr\u003eVa 60V; Vf 6.3V\u003cbr\u003eAverage 100%: Ia = 42 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlate current\u003cbr\u003eSection 1: Ia =\u0026nbsp;45 mA\u003cbr\u003eSection 2: Ia =\u0026nbsp;47 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eTest for Short Circuits\u003cbr\u003eEmission Quality\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":46453754003804,"sku":"01258","price":49.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_e9e70440-8945-42f7-8d8c-afee8167dd9f.jpg?v=1679578855"},{"product_id":"6x4-ez90-nos-rca-rectifier-made-1950s-with-dimple-d-square-getter-for-audio-note-1","title":"6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED GETTER for AUDIO NOTE","description":"\u003cp\u003e\u003cstrong\u003e6X4 ( EZ90 ) RCA RECTIFIER MADE 1950s with FOIL DIMPLED\u0026nbsp;GETTER for AUDIO NOTE\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAfterMarket BOX\u003cbr\u003eLogo worn as in photo\u003cbr\u003e\u003cbr\u003eThe offer is for a rectifier valve\u003cbr\u003eTested on Funke W19 Tube tester:\u003cbr\u003eOur tools are calibrated with tubes of reference.\u003cbr\u003eVa 60V; Vf 6.3V\u003cbr\u003eAverage 100%: Ia = 42 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePlate current\u003cbr\u003eSection 1: Ia =\u0026nbsp;46 mA\u003cbr\u003eSection 2: Ia =\u0026nbsp;46 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eTest for Short Circuits\u003cbr\u003eEmission Quality\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":46453774156124,"sku":"01259","price":49.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_e90b1eae-00d5-4f3c-b94b-1d5feedfd7b4.jpg?v=1679579636"},{"product_id":"copia-del-6au4gta-6au4-6au4gt-rca-radio-flyback-diode-dumper-tube-valve-nos-nib","title":"6AU4GTA=6AU4=6AU4GT RCA Radio flyback Diode Dumper tube valve NOS NIB","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6AU4GTA = 6AU4 = 6AU4GT RCA Radio flyback Diode Dumper tube valve NOS\u0026nbsp;NIB\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTubes tested on AVO VCM 163 Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test:\u0026nbsp; Vf = 6.3V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTest Result: VERY STRONG \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eFurther tests performed:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eEmission quality\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eShort circuit test\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":46709534130524,"sku":"01416V","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_08e9507e-179b-465c-a535-904630284422.jpg?v=1684515087"},{"product_id":"5r4gy-jan-cv717-ken-rad-black-plates-dual-bottom-square-getter-matched-tubes-rectifiers-made-in-usa-40s","title":"5R4GY JAN ( CV717 ) KEN-RAD Black Plates Dual Bottom Square Getter Matched Tubes Rectifiers Made in USA '40s","description":"\u003cp\u003e\u0026nbsp;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5R4GY JAN ( CV717 ) KEN-RAD Black Plates Dual Bottom Square Getter Matched Tubes Rectifiers \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA in the 1940s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduced by\u0026nbsp;KEN-RAD U.S.A.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHanging Filaments for Low Noise Power Supply\u003c\/strong\u003e\u0026nbsp;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMilitary destination valve\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eValves tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 100V, Vf = 5V\u003c\/span\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGood from: Ia = 61 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Ia = 95 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;100 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;107 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eValve 2:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;105 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa = 95 mA\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTest for Short Circuits\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTest for GAS\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":46991291613532,"sku":"01586","price":139.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_4fcbce40-de42-40f6-b115-ce6c276426ba.jpg?v=1692294325"},{"product_id":"5y3gt-5z2p-ge-black-plates-halo-getter-tube-rectifier-made-in-usa-67","title":"5Y3GT ( 5Z2P ) GE Black Plates Halo Getter Tube Rectifier Made in USA '67","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5Y3GT ( 5Z2P ) GE Black Plates Halo Getter Tube Rectifier\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA in 1967\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTubes tested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 100V, Vf = 5V\u003cbr\u003eGood from: Ia 60 mA\u003cbr\u003eAverage 100% Ia = 77 .5 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;90 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;89 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003eTest for GAS\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":47386186776924,"sku":"01880","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/8_39576428-b134-402f-b941-d77a1e4e8888.jpg?v=1701423459"},{"product_id":"6x5-gt-6z5p-cbs-hytron-nos-nib-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"6X5 GT ( 6Z5P ) CBS-HYTRON NOS NIB Black Plates Foil Getter Rectifier Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X5 GT ( 6Z5P ) CBS-HYTRON NOS NIB Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 60V, Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100%:\u0026nbsp; Ia =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;51 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;53 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u0026nbsp;\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"CBS-HYTRON","offers":[{"title":"Default Title","offer_id":47436197724508,"sku":"01906","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_f5a426bb-4e8a-4730-ab53-0784a3c17ddb.jpg?v=1702550138"},{"product_id":"copia-del-6x5-gt-6z5p-cbs-hytron-nos-nib-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"6X5 GT ( 6Z5P ) ZENITH NOS NIB Black Plates D Getter Rectifier Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X5 GT ( 6Z5P ) ZENITH NOS NIB Black Plates D Getter Rectifier Tube\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 60V, Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100%:\u0026nbsp; Ia =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;50 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;50 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZENITH","offers":[{"title":"Default Title","offer_id":47436252676444,"sku":"01907","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_2fa82b04-16b6-497e-b0d8-f550083fc928.jpg?v=1702550982"},{"product_id":"6x5-gt-6z5p-fomoco-black-plates-foil-getter-rectifier-tube-made-in-usa","title":"6X5 GT ( 6Z5P ) FOMOCO Black Plates Foil Getter Rectifier Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X5 GT ( 6Z5P ) FOMOCO Black Plates Foil Getter Rectifier Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 60V, Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100%:\u0026nbsp; Ia =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;51 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"FOMOCO","offers":[{"title":"Default Title","offer_id":47436400197980,"sku":"01909","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_093d8eac-46f3-4558-9b66-7afc0f33a673.jpg?v=1702553299"},{"product_id":"5y3gt-5z2p-coronado-black-plates-halo-getter-tube-rectifier-made-in-usa","title":"5Y3 GT ( 5Z2P ) CORONADO Black Plates Halo Getter Tube Rectifier Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5Y3GT ( 5Z2P ) CORONADO Black Plates Halo Getter Tube Rectifier\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTubes tested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 100V, Vf = 5V\u003cbr\u003eGood from: Ia 60 mA\u003cbr\u003eAverage 100% Ia = 77 .5 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;88 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa =\u0026nbsp;86 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003eTest for GAS\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"CORONADO","offers":[{"title":"Default Title","offer_id":47436865700188,"sku":"01910","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_a88d754f-c0fa-46e0-9a4f-ef157e38e1fe.jpg?v=1702562137"},{"product_id":"5v3-5au4-dumont-nos-nib-black-plates-oo-getter-tested-tube-rectifier-made-in-usa","title":"5V3 ( 5AU4 ) DUMONT NOS NIB Black Plates Double Halo Getter - Amplitrex Tested - Tube Rectifier Made in USA","description":"\u003cp data-start=\"146\" data-end=\"245\"\u003e\u003cstrong data-start=\"146\" data-end=\"245\"\u003e5V3 (5AU4) DUMONT NOS NIB Black Plates Double Halo Getter – Tested Tube Rectifier – Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"247\" data-end=\"806\"\u003e\u003cstrong data-start=\"247\" data-end=\"263\"\u003eDescription:\u003c\/strong\u003e\u003cbr data-start=\"263\" data-end=\"266\"\u003eThe Dumont 5V3 (5AU4) is a full-wave rectifier tube manufactured in the United States during the 1940s–1950s.\u003cbr data-start=\"375\" data-end=\"378\"\u003eAlthough branded Dumont, this specimen was actually produced by Sylvania, one of the most renowned American manufacturers of that era.\u003cbr data-start=\"512\" data-end=\"515\"\u003eIt comes in NOS NIB (New Old Stock – New in Box) condition, featuring black plates and the rare double halo getter system – a configuration that ensures robustness and long operational life.\u003cbr data-start=\"705\" data-end=\"708\"\u003eThe tube has been carefully tested on the Amplitrex AT-1000, measuring strong and fully efficient.\u003c\/p\u003e\n\u003ch3 data-start=\"813\" data-end=\"861\"\u003eTonal Characteristics and Sonic Behavior\u003c\/h3\u003e\n\u003cp data-start=\"863\" data-end=\"989\"\u003e\u003cstrong data-start=\"863\" data-end=\"872\"\u003eBass:\u003c\/strong\u003e Deep, tight, and well-controlled, with no unwanted boominess. Provides stability across the entire audio spectrum.\u003c\/p\u003e\n\u003cp data-start=\"991\" data-end=\"1105\"\u003e\u003cstrong data-start=\"991\" data-end=\"1004\"\u003eMidrange:\u003c\/strong\u003e Transparent and natural, delivering excellent timbral accuracy on vocals and acoustic instruments.\u003c\/p\u003e\n\u003cp data-start=\"1107\" data-end=\"1239\"\u003e\u003cstrong data-start=\"1107\" data-end=\"1117\"\u003eHighs:\u003c\/strong\u003e Extended and smooth, bright but free of harshness, with a natural decay that brings air and openness to the soundstage.\u003c\/p\u003e\n\u003cp data-start=\"1241\" data-end=\"1349\"\u003e\u003cstrong data-start=\"1241\" data-end=\"1254\"\u003eDynamics:\u003c\/strong\u003e Fast and coherent, capable of handling both micro-details and complex peaks with confidence.\u003c\/p\u003e\n\u003cp data-start=\"1351\" data-end=\"1476\"\u003e\u003cstrong data-start=\"1351\" data-end=\"1366\"\u003eSoundstage:\u003c\/strong\u003e Stable and three-dimensional, with good instrument separation and a clearly perceptible “black background.”\u003c\/p\u003e\n\u003ch3 data-start=\"1483\" data-end=\"1515\"\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1516\" data-end=\"1698\"\u003eAn excellent choice as a rectifier in high-end stereo amplifiers and preamplifiers.\u003cbr data-start=\"1599\" data-end=\"1602\"\u003eIts stable power delivery translates into greater detail, transparency, and musical coherence.\u003c\/p\u003e\n\u003ch3 data-start=\"1700\" data-end=\"1745\"\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1746\" data-end=\"1898\"\u003eAlso well-suited for vintage instrument and organ amplifiers, where it ensures reliable, quiet current delivery along with a robust and dynamic sound.\u003c\/p\u003e\n\u003ch3 data-start=\"1900\" data-end=\"1945\"\u003e🎯 Note for Audiophiles and Technicians\u003c\/h3\u003e\n\u003cp data-start=\"1946\" data-end=\"2371\"\u003eThe Dumont 5V3 (5AU4) Black Plates with double halo getter, manufactured by Sylvania, is considered one of the finest versions of this series.\u003cbr data-start=\"2088\" data-end=\"2091\"\u003eIts combination of electrical ruggedness and musical sonic performance makes it ideal both for vintage equipment restoration and for use in high-level hi-fi systems.\u003cbr data-start=\"2256\" data-end=\"2259\"\u003eThis specimen is offered as NOS NIB and Amplitrex Tested, ensuring reliable performance and long service life.\u003c\/p\u003e\n\u003chr data-start=\"2373\" data-end=\"2376\"\u003e\n\u003ch3 data-start=\"2378\" data-end=\"2399\"\u003eTest Results\u003c\/h3\u003e\n\u003cp data-start=\"2400\" data-end=\"2448\"\u003eTubes tested on \u003cstrong\u003eAmplitrex AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 278V, Vf = 5V\u003c\/li\u003e\n\u003cli\u003eForward Voltage Drop: \u003cstrong\u003e20–21 V peak (balanced sections)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eReverse Leakage: \u003cstrong\u003e396–396 V peak (excellent)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2643\" data-end=\"2663\"\u003e\u003cstrong data-start=\"2643\" data-end=\"2661\"\u003ePlate Current:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection\u0026nbsp;1:\u003c\/strong\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa = 120 mA\u0026nbsp; \u0026nbsp;\u0026nbsp;\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eSection 2:\u003c\/strong\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eIa = 120 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2719\" data-end=\"2742\"\u003e\u003cstrong data-start=\"2719\" data-end=\"2740\"\u003eAdditional Tests:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophony:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eStandard. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eExcellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eAbsent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2948\" data-end=\"2951\"\u003e\n\u003ch3 data-start=\"2953\" data-end=\"2971\"\u003eCondition\u003c\/h3\u003e\n\u003cul data-start=\"2972\" data-end=\"3306\"\u003e\n\u003cli data-start=\"2972\" data-end=\"3081\"\u003e\n\u003cp data-start=\"2974\" data-end=\"3081\"\u003e\u003cstrong data-start=\"2974\" data-end=\"2988\"\u003eCondition:\u003c\/strong\u003e NOS – NIB – New Old Stock, New in Box – Tested and working – Supplied in its original box.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3082\" data-end=\"3123\"\u003e\n\u003cp data-start=\"3084\" data-end=\"3123\"\u003e\u003cstrong data-start=\"3084\" data-end=\"3102\"\u003eFunctionality:\u003c\/strong\u003e Fully operational.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3124\" data-end=\"3234\"\u003e\n\u003cp data-start=\"3126\" data-end=\"3234\"\u003e\u003cstrong data-start=\"3126\" data-end=\"3149\"\u003eCosmetic Condition:\u003c\/strong\u003e Excellent – Markings well preserved, minimal signs of age. See photos for details.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3235\" data-end=\"3306\"\u003e\n\u003cp data-start=\"3237\" data-end=\"3306\"\u003e\u003cstrong data-start=\"3237\" data-end=\"3258\"\u003eManufacture Code:\u003c\/strong\u003e 312 6-31 – Produced by SYLVANIA in July 1946.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca title=\"Dyscover Why Our Tubes Are Different\" href=\"https:\/\/vacuumtubestreasures.com\/en\/blogs\/news\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different\u0026nbsp;→\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"DUMONT","offers":[{"title":"Default Title","offer_id":48698817708380,"sku":"02189U","price":48.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_32d80627-d5af-400e-9111-54534a027220.jpg?v=1715848134"},{"product_id":"6x5-gt-6z5p-sylvania-nos-nib-black-plates-tall-bottle-matched-pair-rectifier-tube-made-in-usa","title":"6X5 GT ( 6Z5P ) SYLVANIA NOS NIB Black Plates Tall Bottle Matched Pair Tubes MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6X5 GT ( 6Z5P ) SYLVANIA NOS NIB Black Plates Tall Bottle Matched Pair Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIn original box (one of them in very poor condition)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTubes tested on Funke W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 60V, Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100%:\u0026nbsp; Ia =\u0026nbsp;52 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current\u003cbr\u003eValve 1:\u003cbr\u003eSection 1: Ia = 46 mA\u003cbr\u003eSection 2: Ia = 45 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Ia = 46 mA\u003cbr\u003eSection 2: Ia = 45 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophony Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":48974405009756,"sku":"02318","price":49.8,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_8cd49695-49eb-4ee2-b54f-d5bec93ab06c.jpg?v=1719685566"},{"product_id":"5ar4-gz34-nos-amperex-bugle-boy-holland-f33-smooth-same-codes-matched-pair-tubes-rectifiers-made-in-gt-holland","title":"5AR4 ( GZ34 ) NOS AMPEREX Bugle Boy, Holland f33, smooth, Same codes, Matched Pair Tubes Rectifiers Made in HOLLAND","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5AR4 ( GZ34 ) NOS AMPEREX Bugle Boy, Holland f33, smooth, Same codes, Matched Pair Tubes Rectifiers\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in HOLLAND\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e This pair of NOS AMPEREX Bugle Boy 5AR4 (GZ34) tubes are renowned for their excellent sonic qualities. These tubes are prized for their openness and reliability, similar to Mullards but with a wider opening characteristic, which contributes to a more detailed and spacious. They were produced in Mazda's factory in Brussels in 1951 and are renowned for their rich sound and ability to significantly improve the audio quality of amplifiers and hi-fi systems. They offer an excellent balance between deep bass and clear highs , producing a very satisfying and versatile overall listening experience, suitable for various musical genres. Their sturdy construction and refined build quality make them an excellent choice for audiophiles and sound professionals looking to optimize the performance of their audio equipment .\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMPEREX Brussels plant production\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMANUFACTURE CODE: \u003cstrong\u003ef33 L1E\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eReboxed in our custom white box\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTubes tested on FUNKE W19 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 60V, Vf = 5V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eGood from: Ia 55 mA\u003c\/span\u003e\u003cbr\u003eAverage 100% Ia = 100 mA\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlate current:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003e\u003cspan\u003eSection 1:\u003c\/span\u003e \u003cspan\u003eIa = 100 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u003c\/span\u003e \u003cspan\u003eIa = 100 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eValve 2:\u003cbr\u003eSection 1: Ia = 99 mA\u003cbr\u003eSection 2: Ia = 99 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophone Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":49385734701404,"sku":"02418M","price":589.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_e0866d86-98dc-42ce-ad35-87715a0149a9.jpg?v=1726674774"},{"product_id":"5ar4-gz34-nos-amperex-by-philips-sittard-f31-x9a-dd-getter-tested-tube-rectifier-made-id-holland","title":"5AR4 ( GZ34 ) – Amperex Philips Sittard f31 X9A – DD Getter – Holland '50s – 100% Strong Tested – Rectifier Tube","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5AR4 ( GZ34 ) NOS NIB AMPEREX by Philips Sittard f31 X9A DD Getter, Tested Tube Rectifier MADE IN HOLLAND '50s\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"1163\" data-start=\"530\"\u003eThe \u003cstrong data-end=\"556\" data-start=\"533\"\u003e5AR4 \/ GZ34 AMPEREX\u003c\/strong\u003e , made by \u003cstrong data-end=\"600\" data-start=\"572\"\u003ePhilips Sittard (Holland)\u003c\/strong\u003e in the 1950s, with \u003cstrong data-end=\"639\" data-start=\"621\"\u003ecode f31 X9A\u003c\/strong\u003e and \u003cstrong data-end=\"690\" data-start=\"642\"\u003edouble D-getter\u003c\/strong\u003e , is one of the rarest and most sought-after versions of this rectifier. Appreciated by enthusiasts for its \u003cstrong data-end=\"823\" data-start=\"801\"\u003esolid construction\u003c\/strong\u003e , \u003cstrong data-end=\"865\" data-start=\"828\"\u003eextraordinary electrical stability\u003c\/strong\u003e and \u003cstrong data-end=\"912\" data-start=\"871\"\u003enatural and musical sound contribution\u003c\/strong\u003e , it represents today one of the finest choices for powering high-end hi-fi and instrumental tube systems. This tube is \u003cstrong data-end=\"1064\" data-start=\"1057\"\u003eNOS\u003c\/strong\u003e , \u003cstrong data-end=\"1092\" data-start=\"1066\"\u003eelectrically tested\u003c\/strong\u003e , and comes from a selection of authentic \u003cem data-end=\"1162\" data-start=\"1145\"\u003eMade in Holland\u003c\/em\u003e examples.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1443\" data-start=\"1165\"\u003e\u003cstrong data-end=\"1174\" data-start=\"1165\"\u003eBass\u003c\/strong\u003e : compact and well articulated, with a solid and deep structure that supports the system without swelling. The low range is taut, precise, and always under control, with an excellent ability to support high dynamic loads without loss of definition.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1681\" data-start=\"1445\"\u003e\u003cstrong data-end=\"1453\" data-start=\"1445\"\u003eMids\u003c\/strong\u003e : transparent and linear, with a neutral and coherent timbre rendering. Voices and acoustic instruments are reproduced realistically, without emphasis, with a balance that enhances the naturalness of the sound message.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1913\" data-start=\"1683\"\u003e\u003cstrong data-end=\"1691\" data-start=\"1683\"\u003eHighs\u003c\/strong\u003e : Airy, refined and always musical. The high-end extension develops with delicacy and precision, helping to maintain a bright but never fatiguing soundstage, even in highly resolving amplifiers.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2196\" data-start=\"1915\"\u003e\u003cstrong data-end=\"1927\" data-start=\"1915\"\u003eDynamics\u003c\/strong\u003e : smooth and responsive, with a prompt response to current demands and a remarkable ability to handle the fastest transients without stiffening. Voltage delivery is progressive, well damped, with a beneficial effect on the overall coherence of the system.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2473\" data-start=\"2198\"\u003e\u003cstrong data-end=\"2212\" data-start=\"2198\"\u003eSoundstage\u003c\/strong\u003e : tidy, stable and coherent. Even though it is a rectifier tube, the influence on the sound is clearly perceived in the \u003cstrong data-end=\"2374\" data-start=\"2348\"\u003ecleanliness of the black background\u003c\/strong\u003e , in the \u003cstrong data-end=\"2417\" data-start=\"2382\"\u003edefinition of the microdynamics\u003c\/strong\u003e and in the \u003cstrong data-end=\"2451\" data-start=\"2426\"\u003eoverall clarity\u003c\/strong\u003e of the musical scene.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3010\" data-start=\"2475\"\u003eThe \u003cstrong data-end=\"2522\" data-start=\"2478\"\u003e5AR4 AMPEREX Sittard f31 Double D-Getter\u003c\/strong\u003e is ideal for integrated amplifiers, tube preamplifiers, single-ended or push-pull power amplifiers that use this type of rectifier. It is particularly suitable for systems that require \u003cstrong data-end=\"2741\" data-start=\"2717\"\u003emaximum reliability\u003c\/strong\u003e , \u003cstrong data-end=\"2781\" data-start=\"2743\"\u003evoltage stability over time\u003c\/strong\u003e and \u003cstrong data-end=\"2810\" data-start=\"2784\"\u003eabsence of coloration\u003c\/strong\u003e , such as in \u003cstrong data-end=\"2865\" data-start=\"2826\"\u003eboutique guitar amplifiers\u003c\/strong\u003e (e.g. \u003cstrong data-end=\"2883\" data-start=\"2871\"\u003eVox AC30\u003c\/strong\u003e , \u003cstrong data-end=\"2904\" data-start=\"2885\"\u003eMatchless DC-30\u003c\/strong\u003e ) where the quality of the power supply section is crucial to the sonic response of the entire circuit.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3489\" data-start=\"3012\"\u003e🎯 \u003cstrong data-end=\"3041\" data-start=\"3015\"\u003eNote for audiophiles\u003c\/strong\u003e : \u003cbr data-end=\"3045\" data-start=\"3042\"\u003e\u003cstrong data-end=\"3068\" data-start=\"3054\"\u003eVery rare\u003c\/strong\u003e version with \u003cstrong data-end=\"3094\" data-start=\"3073\"\u003edouble D getter\u003c\/strong\u003e , sought after by collectors and enthusiasts for its combination of top-level electrical and musical performance. Ideal for those who want the best in terms of \u003cstrong data-end=\"3312\" data-start=\"3273\"\u003eclarity, articulation and neutrality\u003c\/strong\u003e , without introducing any unwanted coloration. A fundamental component for reference hi-fi systems or for vintage amplifiers restored with original components.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"569\" data-start=\"521\"\u003e🎸 \u003cstrong data-end=\"569\" data-start=\"524\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"922\" data-start=\"571\"\u003eThe \u003cstrong data-end=\"618\" data-start=\"574\"\u003e5AR4 AMPEREX Sittard with Double D-Getter\u003c\/strong\u003e , thanks to its \u003cstrong data-end=\"679\" data-start=\"636\"\u003esmooth and stable tension delivery\u003c\/strong\u003e , is one of the most sought-after rectifiers also in the instrumental field. Its progressive, never aggressive response favors a \u003cstrong data-end=\"835\" data-start=\"810\"\u003enatural compression\u003c\/strong\u003e , much appreciated by musicians who want a \u003cstrong data-end=\"921\" data-start=\"892\"\u003ewarm, round and dynamic\u003c\/strong\u003e sound.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1385\" data-start=\"924\"\u003eIt is particularly suited to circuits that benefit from well-damped tube rectification, such as those found in \u003cstrong data-end=\"1058\" data-start=\"1046\"\u003ethe Vox AC30\u003c\/strong\u003e , \u003cstrong data-end=\"1078\" data-start=\"1060\"\u003eMarshall JTM45\u003c\/strong\u003e , \u003cstrong data-end=\"1100\" data-start=\"1080\"\u003eHiwatt DR Series\u003c\/strong\u003e , \u003cstrong data-end=\"1121\" data-start=\"1102\"\u003eMatchless DC-30\u003c\/strong\u003e , or in boutique amps built with NOS parts. In these contexts, the Sittard AMPEREX offers a \u003cstrong data-end=\"1244\" data-start=\"1221\"\u003econtrolled attack\u003c\/strong\u003e , \u003cstrong data-end=\"1269\" data-start=\"1249\"\u003emusical sustain\u003c\/strong\u003e , and a \u003cstrong data-end=\"1309\" data-start=\"1276\"\u003esmooth transition to breakup\u003c\/strong\u003e , contributing to a natural, consistent, and always musical touch response.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003e\u003cspan\u003eFUNKE W19\u003c\/span\u003e\u003c\/strong\u003e Tube tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eGood from:\u003c\/strong\u003e Ia = 55 mA\u003c\/span\u003e \u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 100 mA\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003ePlate current:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eIa = 100 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eIa = 102 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAdditional Tests\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophony:\u003c\/strong\u003e Standard. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eExcellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eConditions:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eNOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box (see photo for box condition).\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e \u003cspan\u003eSufficient – Writings almost completely disappeared. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003ef31 X9A - Manufactured in the Sittard plant - in January 1959\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":53507510796636,"sku":"02598L","price":299.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/10_f301b121-5045-421d-93ff-c57e040721a0.jpg?v=1732370878"},{"product_id":"jan-cg-6x5-gt-6z5p-ge-nos-nib-black-plates-square-getter-rectifier-tube-made-in-usa-52","title":"JAN CG 6X5 GT ( 6Z5P ) GE NOS NIB Black Plates Square Getter Rectifier Tube MADE IN USA '52","description":"\u003cp\u003e\u003cstrong\u003eJAN CG 6X5 GT ( 6Z5P ) GE NOS NIB Black Plates Square Getter Rectifier Tube MADE IN USA '52\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eJAN CG 6X5 GT (6Z5P) GE NOS NIB Black Plates Square Getter\u003c\/strong\u003e , manufactured in the USA in 1952, is a rectifier appreciated for its reliability and ability to ensure balanced and stable sound reproduction. With its sturdy construction and black plates, this valve is an excellent choice for Hi-Fi amplifiers and vintage audio equipment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range\u003c\/strong\u003e : Deep and well-controlled, with a solid response that provides stability and articulation, perfect for a coherent and dynamic sound base.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange\u003c\/strong\u003e : Natural and warm, with a detailed harmonic rendition that enhances voices and instruments, creating an engaging and realistic sound.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh range\u003c\/strong\u003e : Crystal clear and refined, with a balanced brilliance that highlights the finest details without ever being tiring.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6X5 GT GE\u003c\/strong\u003e stands out for its ability to maintain a wide and well-focused soundstage, with excellent instrument separation and fluid dynamics. This rectifier is an ideal choice for those seeking a combination of construction robustness, musicality and technical precision in audio applications. high-end.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTubes tested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003cbr\u003e\u003cstrong\u003eAverage 100%\u003c\/strong\u003e Ia: 52 mA\u003cbr\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMeasured Values:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve :\u003cbr\u003eSection 1: Ia = 52 mA\u003cbr\u003eSection 2: Ia = 51 mA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional tests performed:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMicrophonics Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":53702158090588,"sku":"02659","price":24.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_37ba53bd-dff0-43e6-9c7f-da0cb626308e.jpg?v=1735403122"},{"product_id":"jan-crc-6x5-gt-6z5p-rca-black-plates-d-getter-rectifier-tube-made-in-usa-53","title":"JAN CRC 6X5 GT ( 6Z5P ) RCA Black Plates D Getter Rectifier Tube MADE IN USA '53","description":"\u003cp\u003e\u003cstrong\u003eJAN CRC 6X5 GT ( 6Z5P ) RCA Black Plates D Getter Rectifier Tube MADE IN USA '53\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eJAN CRC 6X5 GT (6Z5P) RCA Black Plates D Getter\u003c\/strong\u003e , manufactured in the USA in 1953, is a highly regarded rectifier for its solid construction and excellent sound characteristics. With black plates and \"D\" shaped getters, This valve offers stable, detailed and well-balanced sound reproduction, ideal for Hi-Fi amplifiers and vintage audio equipment.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range\u003c\/strong\u003e : Deep and well-articulated, with a precise response that provides a solid and dynamic sound base, ideal for quality music reproduction.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange\u003c\/strong\u003e : Rich and natural, with a warm harmonic rendition that enhances vocals and acoustic instruments, creating an immersive and detailed sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh range\u003c\/strong\u003e : Clean and transparent, with a refined brilliance that highlights details without tiring the listener, maintaining an excellent sonic balance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003eRCA 6X5 GT\u003c\/strong\u003e stands out for its ability to maintain a wide and well-focused soundstage, with precise instrument separation and fluid dynamics. This tube is an ideal choice for those seeking robustness, reliability and musicality in high-end audio applications. .\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTubes tested on Funke W19 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003cbr\u003e\u003cstrong\u003eAverage 100%\u003c\/strong\u003e Ia: 52 mA\u003cbr\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMeasured Values:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve :\u003cbr\u003eSection 1: Ia = 57 mA\u003cbr\u003eSection 2: Ia = 57 mA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional tests performed:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMicrophonics Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":53702231163228,"sku":"02660","price":19.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_888fa546-cb85-40f1-8036-a912a129e72b.jpg?v=1735404554"},{"product_id":"jan-crc-83-gt-vt-83-nos-rca-black-plates-hanging-filaments-foil-getter-tube-rectifier-made-in-usa-44","title":"RCA JAN CRC 83 (VT-83) Rectifier Tube – NOS NIB 1944 – Black Plates Foil Getter – Made in USA","description":"\u003cp\u003e\u003cstrong\u003eJAN CRC 83 ( VT-83 ) NOS RCA Black Plates Hanging Filaments Foil Getter Tube Rectifier Made in USA '44\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eJAN CRC 83 (VT-83) NOS RCA Black Plates Hanging Filaments Foil Getter\u003c\/strong\u003e , manufactured in the USA in 1944, is an exceptional rectifier designed for military applications, featuring rugged construction and refined sound output. Thanks to the suspended filaments ( \"Hanging Filaments\") and Foil Getter, this tube ensures stable performance and precise, musical sound reproduction, ideal for vintage audio equipment and tube amplifiers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range\u003c\/strong\u003e : Deep and controlled, with a tight, well-defined response that provides a solid, authoritative sound base.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange\u003c\/strong\u003e : Natural and warm, with detailed harmonic reproduction that enhances vocals and acoustic instruments, creating an immersive and realistic sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh range\u003c\/strong\u003e : Refined and transparent, with a balanced brilliance that enhances details without tiring the listener, maintaining a musical and pleasant sound character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003eJAN CRC 83 RCA\u003c\/strong\u003e stands out for its ability to create a wide and well-focused soundstage, with excellent instrument separation and fluid dynamics. This rectifier is an ideal choice for those looking for a combination of construction robustness, precision and musicality in audio applications. high level.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003cbr\u003e- Valve tested on \u003cstrong\u003eFUNKE W19\u003c\/strong\u003e Tube Tester:\u003cbr\u003e- Test Conditions: Va = 60V, Vf = 5V\u003cbr\u003e- Average 100%: Ia = 123 mA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e- Test Result:\u003c\/strong\u003e VERY STRONG\u003cbr\u003e- Valve 1:\u003cbr\u003eSection 1: Ia: 110 mA\u003cbr\u003eSection 2: Ia: 118 mA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003cbr\u003e- Aesthetic Condition: NOS - New Old Stock, tested and working - In our custom box\u003cbr\u003e- Functionality: Fully operational.\u003cbr\u003e- Manufacturing Code: H6E\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":53711209955676,"sku":"02662I","price":129.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_169b6890-0421-44c7-8748-aaf3db2c0060.jpg?v=1735562505"},{"product_id":"jan-crc-83-vt-83-nos-rca-black-plates-hanging-filaments-foil-getter-tube-rectifier-made-in-usa-44-copia","title":"6CA4 ( EZ81 ) NOS NIB RCA Gray Plates Halo Getter Matched Pair Tubes Rectifiers Made in USA '66","description":"\u003cp\u003e\u003cstrong\u003e6CA4 ( EZ81 ) NOS NIB RCA Gray Plates Halo Getter Matched Pair Tubes Rectifiers Made in USA '66\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 (EZ81) NOS NIB RCA Gray Plates Halo Getter\u003c\/strong\u003e , made in the USA in 1966, are rectifiers renowned for their reliability and distinctive sonic contribution. This \u003cstrong\u003ematched pair\u003c\/strong\u003e is ideal for vintage tube amplifiers and high-end Hi-Fi applications. high, offering a balanced and musical sound reproduction, with the characteristic warm timbre of RCA valves.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLows:\u003c\/strong\u003e Deep and well-defined, with a tight and controlled response that provides a solid and stable sonic foundation. Ideal for genres that require precise and articulated dynamics.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and transparent, with a harmonic richness that enhances vocals and acoustic instruments, offering an immersive and natural sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Clean and crisp, with crystal clarity that brings out the finest details without being fatiguing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 RCA Gray Plates\u003c\/strong\u003e stand out for their ability to maintain a wide and well-focused soundstage, with fluid dynamics and excellent instrument separation. This matched set is an excellent choice for those seeking a combination of musicality and sonic accuracy in audio applications. high level.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 74 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 78 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 80 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 78 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 80 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e NR = January 1966\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":53725884318044,"sku":"02664","price":84.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_93e97de4-7d23-44e5-bb84-0d67fa738fe4.jpg?v=1735834185"},{"product_id":"6ca4-ez81-nos-nib-mullard-for-sylvania-gray-plates-horse-shoe-getter-tested-tube-rectifier-made-in-gt-britain-65","title":"6CA4 ( EZ81 ) NOS NIB SYLVANIA by MULLARD Blackburn Gray Plates Horse Shoe Getter Tested Tube Rectifier Made in GT. Britain '65","description":"\u003cp\u003e\u003cstrong\u003e6CA4 ( EZ81 ) NOS NIB SYLVANIA by MULLARD Blackburn Gray Plates Horse Shoe Getter Tested Tube Rectifier Made in GT. Britain '65\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 (EZ81) NOS NIB Sylvania by Mullard Blackburn\u003c\/strong\u003e , manufactured in Blackburn, Great Britain, in 1965, is a legendary rectifier known for its musical and refined sound contribution. Made with grey plates and a horseshoe-shaped getter ( \u003cstrong\u003eHorse Shoe Getter\u003c\/strong\u003e ), this valve combines Mullard quality with Sylvania reliability, offering a warm, detailed and balanced sound. Ideal for vintage valve amplifiers and high-end Hi-Fi systems, it guarantees excellent performance both in terms of musicality and of precision.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range:\u003c\/strong\u003e Deep and well-defined, with a controlled response that provides a stable and dynamic sound base. Ideal for a full-bodied and articulate sound.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and transparent, with a rich and natural harmonic rendition that enhances vocals and acoustic instruments, creating an engaging and detailed sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Refined and brilliant, with a balanced clarity that enhances details without ever being fatiguing, maintaining a pleasant and natural musicality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 Sylvania by Mullard Blackburn\u003c\/strong\u003e stands out for its ability to create a wide and three-dimensional soundstage, with excellent instrument separation and fluid dynamics. This tube is an excellent choice for those looking for an authentic, musical sound with the charm timeless Mullard valves.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 74 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 86 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 88 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e B5C3 = 3rd Week of March 1965\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":53726153015644,"sku":"02665","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/6_15528322-6777-48c8-9ec5-50936bc02401.jpg?v=1735837680"},{"product_id":"6ca4-ez81-nos-nib-sylvania-gray-copper-plates-halo-getter-tested-tube-rectifier-made-in-usa","title":"6CA4 ( EZ81 ) NOS NIB SYLVANIA Gray Copper Plates Halo Getter Tested Tube Rectifier Made in USA","description":"\u003cp\u003e\u003cstrong\u003e6CA4 ( EZ81 ) NOS NIB SYLVANIA Gray Copper Plates Halo Getter Tested Tube Rectifier Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 (EZ81) NOS NIB Sylvania\u003c\/strong\u003e , made in the USA, is a high-quality rectifier, known for its sturdy construction and distinctive sonic contribution. With gray copper plates and a ring getter ( \u003cstrong\u003eHalo Getter\u003c\/strong\u003e ), this tube ensures stable performance and well-balanced sound, making it ideal for vintage tube amplifiers and high-end Hi-Fi systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow End:\u003c\/strong\u003e Deep and controlled, with a tight, well-defined response that provides a solid, dynamic sound base. Perfect for genres that require precision and impact in the bass.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and transparent, with a natural harmonic rendition that enhances vocals and acoustic instruments, creating an immersive and detailed sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Clean and bright, with crystal clarity that highlights details without being fatiguing, maintaining a natural and balanced musical character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 Sylvania Gray Copper Plates\u003c\/strong\u003e excels in its ability to create a wide and well-focused soundstage, with smooth dynamics and excellent instrument separation. This rectifier is an excellent choice for those seeking authentic, refined and musical sound for high-end audio applications. level.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 74 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 82 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 84 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e NR RAE - Undecipherable ( Export Quality )\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":53731417850204,"sku":"02666","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_fc52e633-9349-4486-95f7-175143067f9f.jpg?v=1735910417"},{"product_id":"6ca4-ez81-nos-nib-sylvania-by-mullard-blackburn-gray-plates-horse-shoe-getter-tested-tube-rectifier-made-in-gt-britain-65-copia","title":"6CA4 ( EZ81 ) NOS NIB ZENITH by MULLARD Gray Plates Halo Getter Tested Tube Rectifier Made in GT. Britain","description":"\u003cp\u003e\u003cstrong\u003e6CA4 ( EZ81 ) NOS NIB ZENITH by MULLARD Gray Plates Halo Getter Tested Tube Rectifier Made in GT. Britain\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 (EZ81) NOS NIB Zenith by Mullard\u003c\/strong\u003e, manufactured in Great Britain, is a high-quality rectifier designed with Mullard craftsmanship and distributed under the Zenith brand. Featuring \u003cstrong\u003egray plates\u003c\/strong\u003e and a \u003cstrong\u003eHalo Getter\u003c\/strong\u003e, this tube is celebrated for its combination of reliability and refined sonic performance, making it ideal for vintage tube amplifiers and high-end Hi-Fi systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eBass:\u003c\/strong\u003e Deep and controlled, with tight response providing a stable and authoritative sonic foundation, perfect for dynamic and detailed musical genres.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and natural, with harmonic richness that enhances vocals and acoustic instruments, delivering engaging and lifelike sound.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTreble:\u003c\/strong\u003e Transparent and bright, with refined clarity that highlights details without causing listener fatigue, maintaining a balanced and pleasant musical character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6CA4 Zenith by Mullard\u003c\/strong\u003e excels in creating a wide and well-focused soundstage, with precise instrument separation and smooth dynamics. It is an outstanding choice for those seeking a reliable and musical rectifier with the charm of Mullard production.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 74 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 86 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia =\u0026nbsp;86 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e -\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZENITH","offers":[{"title":"Default Title","offer_id":53731710370140,"sku":"02668S","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_b0d18df2-759a-4ad4-a7e8-f753034a0cef.jpg?v=1735915322"},{"product_id":"6x4-ez90-nos-nib-dumont-black-plates-halo-getter-tested-tube-rectifier-made-in-usa-69","title":"6X4 EZ90 NOS NIB Dumont Black Plates Halo Getter Tested Rectifier Tube USA 1969","description":"\u003cp\u003e\u003cstrong\u003e6X4 ( EZ90 ) NOS NIB DUMONT Black Plates Halo Getter Tested Tube Rectifier Made in USA '69\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e6X4 (EZ90) NOS NIB DuMont\u003c\/strong\u003e , produced in the USA in 1969 at the Sylvania works, combines the reliability of American tubes with the characteristic Sylvania build quality. Featuring \u003cstrong\u003eblack plates\u003c\/strong\u003e and a \u003cstrong\u003eHalo Getter\u003c\/strong\u003e , this compact rectifier offers a sound balanced and musical, ideal for vintage tube amplifiers and high-end Hi-Fi systems.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range:\u003c\/strong\u003e Deep and controlled, with a tight response that provides a stable and precise sound base, ideal for musical genres with incisive dynamics.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and transparent, with a natural harmonic rendition that enhances vocals and acoustic instruments, offering a rich and engaging sound experience.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh range:\u003c\/strong\u003e Refined and crystalline, with a balanced brilliance that enhances the details without tiring the listener, maintaining an elegant and natural musical character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003e6X4 DuMont Black Plates\u003c\/strong\u003e stands out for its ability to create a three-dimensional and well-focused soundstage, with excellent instrument separation and fluid dynamics. Being a Sylvania production for DuMont, this tube represents a combination of robustness and musicality, perfect for enthusiasts. of vintage audio.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = \u003cmeta charset=\"utf-8\"\u003e\u003c!-- x-tinymce\/html --\u003e42 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Ia = 49 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Ia = 48 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 312 69-02 - 2nd week of 1969\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"DUMONT","offers":[{"title":"Default Title","offer_id":53732905550172,"sku":"02671S","price":18.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/4_064a6264-6575-4857-88a5-03b977cc7df0.jpg?v=1735925884"},{"product_id":"ez80-6v4-nos-amperex-by-philips-sittard-d-getter-tube-rectifier-made-in-holland-50s","title":"EZ80 ( 6V4 ) NOS AMPEREX BUGLE BOY Sittard Plant D Getter Tube Rectifier MADE IN HOLLAND '50s","description":"\u003cp\u003e\u003cstrong\u003eEZ80 ( 6V4 ) NOS AMPEREX BUGLE BOY Sittard Plant D Getter Tube Rectifier MADE IN HOLLAND '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eEZ80 (6V4) NOS Amperex Bugle Boy\u003c\/strong\u003e , produced in the Sittard factory, Holland, in the 1950s, is a high quality rectifier tube famous for its refined and musical sound contribution. Equipped with a \u003cstrong\u003eD Getter\u003c\/strong\u003e , this tube represents a excellent choice for vintage tube amplifiers and Hi-Fi systems, thanks to its balanced sonic signature and the charm of Amperex Bugle Boy productions.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow range:\u003c\/strong\u003e Deep and controlled, with a precise and articulated response that gives stability and impact to the sound base. Ideal for musical genres that require defined and well-structured bass.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMidrange:\u003c\/strong\u003e Warm and rich, with a natural harmonic rendition that enhances vocals and acoustic instruments, offering an engaging and detailed sound.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Clean and bright, with a balanced clarity that enhances details without being fatiguing, maintaining a natural and elegant musicality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe \u003cstrong\u003eEZ80 Amperex Bugle Boy\u003c\/strong\u003e excels at creating a wide, three-dimensional soundstage, with precise instrument separation and smooth dynamics. This tube is particularly appreciated for its ability to add warmth and musicality, making it an excellent choice for those seeking the charm and the quality of vintage European productions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eValve tested on Funke W19 Tube Tester:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eVa = 60V, Vf = 6.3V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eIa = 53 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eVERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eIa = 55 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eIa = 57 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eNOS - New Old Stock - Tested and working - In aftermarket box.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eFully operational.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e Excellent, slight erosion of the writing. See photo.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing code:\u003c\/strong\u003e kC0 +6I - Philips, Sittard afd 22126 - September 1956\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":53874568167772,"sku":"02716","price":109.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_860cd608-0663-45cb-8e14-86924803f792.jpg?v=1738075131"},{"product_id":"5y3-gt-5z2p-rca-nos-nib-black-plates-square-getter-tube-rectifier-made-in-usa-64","title":"5Y3 GT ( 5Z2P ) RCA NOS NIB Black Plates Square Getter Matched Pair Tubes Rectifiers Made in USA '64","description":"\u003cp\u003e\u003cstrong\u003e5Y3 GT ( 5Z2P ) RCA NOS NIB Black Plates Square Getter Matched Pair Tubes Rectifiers Made in USA '64\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"539\" data-start=\"150\"\u003eThis \u003cstrong data-end=\"175\" data-start=\"164\"\u003ematched\u003c\/strong\u003e pair of \u003cstrong data-end=\"214\" data-start=\"206\"\u003e1964\u003c\/strong\u003e \u003cstrong data-end=\"201\" data-start=\"179\"\u003eRCA NOS NIB 5Y3 GTs\u003c\/strong\u003e , with \u003cstrong data-end=\"252\" data-start=\"220\"\u003eBlack Plates and Square Getter\u003c\/strong\u003e , represents one of the most appreciated rectifiers for its \u003cstrong data-end=\"356\" data-start=\"317\"\u003emusical, sweet and natural response\u003c\/strong\u003e . RCAs of this era are known for their \u003cstrong data-end=\"443\" data-start=\"403\"\u003esmooth and progressive rectification\u003c\/strong\u003e , which contributes to a \u003cstrong data-end=\"536\" data-start=\"480\"\u003ewarm, dynamic sound with an authentic vintage character\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cul data-end=\"1505\" data-start=\"541\"\u003e\n\u003cli data-end=\"737\" data-start=\"541\"\u003e\u003cstrong data-end=\"559\" data-start=\"543\"\u003eLow range:\u003c\/strong\u003e \u003cstrong data-end=\"581\" data-start=\"560\"\u003eSoft and round\u003c\/strong\u003e , with a \u003cstrong data-end=\"623\" data-start=\"596\"\u003eharmonious and controlled\u003c\/strong\u003e bass, without excessive rigidity. It offers a \u003cstrong data-end=\"700\" data-start=\"674\"\u003efluid reproduction and well integrated\u003c\/strong\u003e with the rest of the sound spectrum.\u003c\/li\u003e\n\u003cli data-end=\"981\" data-start=\"738\"\u003e\u003cstrong data-end=\"756\" data-start=\"740\"\u003eMidrange:\u003c\/strong\u003e \u003cstrong data-end=\"777\" data-start=\"757\"\u003eWarm and natural\u003c\/strong\u003e , with an \u003cstrong data-end=\"829\" data-start=\"796\"\u003eorganic character and rich harmonics\u003c\/strong\u003e . The midrange frequencies are \u003cstrong data-end=\"869\" data-start=\"855\"\u003ebalanced\u003c\/strong\u003e , giving an \u003cstrong data-end=\"912\" data-start=\"891\"\u003eopen and musical\u003c\/strong\u003e sound, ideal for emphasizing the nuances of instruments and voices.\u003c\/li\u003e\n\u003cli data-end=\"1192\" data-start=\"982\"\u003e\u003cstrong data-end=\"999\" data-start=\"984\"\u003eHighs:\u003c\/strong\u003e \u003cstrong data-end=\"1022\" data-start=\"1000\"\u003eSilky and refined\u003c\/strong\u003e , with a \u003cstrong data-end=\"1073\" data-start=\"1045\"\u003esoft and non-aggressive\u003c\/strong\u003e brilliance. The highs are \u003cstrong data-end=\"1118\" data-start=\"1094\"\u003eclear and detailed\u003c\/strong\u003e , without harshness, maintaining a \u003cstrong data-end=\"1189\" data-start=\"1156\"\u003etransparent and non-fatiguing\u003c\/strong\u003e performance.\u003c\/li\u003e\n\u003cli data-end=\"1505\" data-start=\"1193\"\u003e\u003cstrong data-end=\"1233\" data-start=\"1195\"\u003eDynamics and Transient Response:\u003c\/strong\u003e \u003cstrong data-end=\"1273\" data-start=\"1234\"\u003eNatural, progressive compression\u003c\/strong\u003e that smooths out harshness in the sound, providing a \u003cstrong data-end=\"1353\" data-start=\"1332\"\u003esmooth, musical\u003c\/strong\u003e delivery. This helps \u003cstrong data-end=\"1400\" data-start=\"1370\"\u003ereduce any harshness\u003c\/strong\u003e in more aggressive amplifiers, giving a \u003cstrong data-end=\"1502\" data-start=\"1474\"\u003emore relaxed, natural\u003c\/strong\u003e feel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1634\" data-start=\"1507\"\u003eThanks to their \u003cstrong data-end=\"1561\" data-start=\"1524\"\u003estable and musical rectification\u003c\/strong\u003e , these \u003cstrong data-end=\"1597\" data-start=\"1570\"\u003e5Y3 GT RCA Black Plates\u003c\/strong\u003e are particularly suitable for:\u003c\/p\u003e\n\u003cul data-end=\"2117\" data-start=\"1635\"\u003e\n\u003cli data-end=\"1782\" data-start=\"1635\"\u003e\u003cstrong data-end=\"1668\" data-start=\"1637\"\u003eVintage hi-fi amplifiers\u003c\/strong\u003e , where they offer a stable voltage and a \u003cstrong data-end=\"1740\" data-start=\"1715\"\u003esmooth, detailed\u003c\/strong\u003e sound, enhancing the musicality of the system.\u003c\/li\u003e\n\u003cli data-end=\"1935\" data-start=\"1783\"\u003e\u003cstrong data-end=\"1815\" data-start=\"1785\"\u003eGuitar amplifiers\u003c\/strong\u003e , which provide \u003cstrong data-end=\"1866\" data-start=\"1841\"\u003enatural compression\u003c\/strong\u003e , emphasizing the \u003cstrong data-end=\"1932\" data-start=\"1884\"\u003ewarmth and fluidity of the dynamic response\u003c\/strong\u003e .\u003c\/li\u003e\n\u003cli data-end=\"2117\" data-start=\"1936\"\u003e\u003cstrong data-end=\"1964\" data-start=\"1938\"\u003eHigh-end audio systems\u003c\/strong\u003e , where a matched pair of rectifiers helps maintain \u003cstrong data-end=\"2080\" data-start=\"2026\"\u003esymmetrical, artefact-free rectification\u003c\/strong\u003e , improving tonal coherence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-is-last-node=\"\" data-end=\"2209\" data-start=\"2119\"\u003eBeing a \u003cstrong data-end=\"2157\" data-start=\"2138\"\u003eNOS NIB matched\u003c\/strong\u003e pair, these tubes **guarantee maximum reliability.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 77.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 95 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 90 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 90 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eIa = 90 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e New Old Stock - New In Box - Tested \u0026amp; Working - In Original Box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Excellent – Perfectly preserved writing, minimal signs of wear. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e AB - AF - March and July 1964 respectively\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":53999160525148,"sku":"02762","price":89.8,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_df45c9e2-d36e-4797-9b98-dad4ad17bd05.jpg?v=1739898667"},{"product_id":"5y3-gt-5z2p-nu-national-union-black-plates-square-getter-tube-rectifier-made-in-usa-50s","title":"5Y3GT 5Z2P NU National Union – Black Plates Square Getter Rectifier Tube USA 1950s","description":"\u003cp\u003e\u003cstrong\u003e5Y3 GT ( 5Z2P ) NU National Union NOS Black Plates Square Getter Tube Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"381\"\u003eThe \u003cstrong data-start=\"50\" data-end=\"97\"\u003e5Y3GT (5Z2P) NU National Union Black Plates\u003c\/strong\u003e \u003cstrong data-start=\"102\" data-end=\"119\"\u003eSquare Getter\u003c\/strong\u003e rectifier, made in the \u003cstrong data-start=\"136\" data-end=\"166\"\u003eUSA in the 1950s\u003c\/strong\u003e , is a tube prized for its ability to provide \u003cstrong data-start=\"228\" data-end=\"264\"\u003esmooth, natural rectification\u003c\/strong\u003e , influencing the amplifier's response with well-regulated voltage and stable current delivery.\u003c\/p\u003e\n\u003cul data-start=\"383\" data-end=\"955\"\u003e\n\u003cli data-start=\"383\" data-end=\"515\"\u003e\u003cstrong data-start=\"385\" data-end=\"394\"\u003eBass\u003c\/strong\u003e : Smooth and controlled, with good articulation that ensures clean reproduction without excessive bloating.\u003c\/li\u003e\n\u003cli data-start=\"516\" data-end=\"669\"\u003e\u003cstrong data-start=\"518\" data-end=\"526\"\u003eMids\u003c\/strong\u003e : Natural and slightly warm, with a smooth presentation and \u003cstrong data-start=\"593\" data-end=\"625\"\u003eexcellent tonal coherence\u003c\/strong\u003e , making the sound enveloping and musical.\u003c\/li\u003e\n\u003cli data-start=\"670\" data-end=\"800\"\u003e\u003cstrong data-start=\"672\" data-end=\"680\"\u003eHighs\u003c\/strong\u003e : Harmonious and never aggressive, with a pleasant extension that preserves detail without introducing listening fatigue.\u003c\/li\u003e\n\u003cli data-start=\"801\" data-end=\"955\"\u003e\u003cstrong data-start=\"803\" data-end=\"815\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"817\" data-end=\"842\"\u003eSmooth and progressive\u003c\/strong\u003e , with excellent transient management that gives \u003cstrong data-start=\"897\" data-end=\"931\"\u003ea touch of vintage musicality\u003c\/strong\u003e to the overall sound.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"957\" data-end=\"1298\"\u003eThe \u003cstrong data-start=\"960\" data-end=\"994\"\u003eNU National Union Black Plates\u003c\/strong\u003e from the 50s are sought after for their \u003cstrong data-start=\"1037\" data-end=\"1096\"\u003esturdy construction and smooth, linear rectification\u003c\/strong\u003e , making them ideal for both \u003cstrong data-start=\"1124\" data-end=\"1190\"\u003ehi-fi amplifiers and vintage guitar amplifiers\u003c\/strong\u003e , where a \u003cstrong data-start=\"1210\" data-end=\"1250\"\u003ewell-regulated, slightly compressed\u003c\/strong\u003e voltage contributes to a \u003cstrong data-start=\"1275\" data-end=\"1295\"\u003ewarm, musical\u003c\/strong\u003e sound.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 77.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 75 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 82 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage - Tested and working - In our custom box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Very Good – Clearly legible writing with minor signs of erosion. Very small surface crack on the base, barely noticeable and with no impact on operation. See photo.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e JC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"National Union","offers":[{"title":"Default Title","offer_id":54019705405788,"sku":"02771Y","price":24.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_b01286b8-e554-4d38-a3b0-eb44db13f6d1.jpg?v=1740138647"},{"product_id":"5u4-g-u52-philco-black-plates-square-getter-tube-rectifier-made-in-usa-55","title":"5U4G U52 Philco by Sylvania – Black Plates Square Getter Rectifier Tube USA 1955","description":"\u003cp\u003e\u003cstrong\u003e5U4 G ( U52 ) PHILCO Black Plates Square Getter Tube Rectifier Made in USA '55\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"473\"\u003eThe \u003cstrong data-start=\"74\" data-end=\"82\"\u003e1955\u003c\/strong\u003e \u003cstrong data-start=\"35\" data-end=\"69\"\u003ePHILCO Black Plates 5U4G (U52)\u003c\/strong\u003e , with \u003cstrong data-start=\"88\" data-end=\"105\"\u003eSquare Getter\u003c\/strong\u003e , is a high quality rectifier tube, built to provide \u003cstrong data-start=\"181\" data-end=\"220\"\u003estable and reliable rectification\u003c\/strong\u003e . Although it does not directly affect the timbre like a signal tube, its ability to provide a \u003cstrong data-start=\"338\" data-end=\"378\"\u003ewell-regulated, fluctuation-free\u003c\/strong\u003e voltage affects the \u003cstrong data-start=\"395\" data-end=\"470\"\u003edynamics, smoothness and overall transparency of the audio system\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cul data-start=\"475\" data-end=\"1133\"\u003e\n\u003cli data-start=\"475\" data-end=\"634\"\u003e\u003cstrong data-start=\"477\" data-end=\"486\"\u003eBass\u003c\/strong\u003e : \u003cstrong data-start=\"488\" data-end=\"518\"\u003eWell controlled and defined\u003c\/strong\u003e , with excellent articulation that ensures clean reproduction, without excessive emphasis or loss of detail.\u003c\/li\u003e\n\u003cli data-start=\"635\" data-end=\"784\"\u003e\u003cstrong data-start=\"637\" data-end=\"645\"\u003eMids\u003c\/strong\u003e : \u003cstrong data-start=\"647\" data-end=\"676\"\u003eBalanced and transparent\u003c\/strong\u003e , with a clear and natural performance, maintaining tonal coherence and excellent separation of instruments.\u003c\/li\u003e\n\u003cli data-start=\"785\" data-end=\"922\"\u003e\u003cstrong data-start=\"787\" data-end=\"795\"\u003eHighs\u003c\/strong\u003e : \u003cstrong data-start=\"797\" data-end=\"821\"\u003eAiry and detailed\u003c\/strong\u003e , free from harshness, with an excellent ability to preserve detail without being fatiguing.\u003c\/li\u003e\n\u003cli data-start=\"923\" data-end=\"1133\"\u003e\u003cstrong data-start=\"925\" data-end=\"937\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"939\" data-end=\"960\"\u003eFluid and natural\u003c\/strong\u003e , with precise transient management that improves the depth and reactivity of the amplifier, favoring a \u003cstrong data-start=\"1099\" data-end=\"1130\"\u003eharmonious and well-structured\u003c\/strong\u003e sound reproduction.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1135\" data-end=\"1504\"\u003eThe \u003cstrong data-start=\"1138\" data-end=\"1161\"\u003ePHILCO Black Plates\u003c\/strong\u003e from the 50s are distinguished by their \u003cstrong data-start=\"1204\" data-end=\"1264\"\u003erobust construction and clean, stable rectification\u003c\/strong\u003e , making them ideal for \u003cstrong data-start=\"1288\" data-end=\"1335\"\u003ehi-fi amplifiers and vintage audio systems\u003c\/strong\u003e , where a \u003cstrong data-start=\"1355\" data-end=\"1382\"\u003econstant, well-regulated\u003c\/strong\u003e voltage helps to achieve a \u003cstrong data-start=\"1411\" data-end=\"1449\"\u003enatural and detailed sound reproduction\u003c\/strong\u003e , with a \u003cstrong data-start=\"1480\" data-end=\"1501\"\u003esmooth and musical\u003c\/strong\u003e sonic presentation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5.0V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 120 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 135 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 120 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eOperation:\u003c\/strong\u003e Stable tube, silent in operation and suitable for providing a regular and well-controlled power supply. Tested with Funke W19 tube tester.\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Valves - Tested and working - In original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e Very Good – Clearly legible writing with slight signs of erosion, no obvious defects. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 5543 - produced 43rd week of 1955\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"PHILCO","offers":[{"title":"Default Title","offer_id":54040063770972,"sku":"02775Y","price":54.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_f4b9ad40-fabf-4c8f-85c4-6aa1746c8bd0.jpg?v=1740400478"},{"product_id":"6x5-gt-6z5p-ge-nos-nib-black-plates-square-getter-rectifier-tube-made-in-usa-53","title":"6X5GT 6Z5P NOS NIB GE – Black Plates Square Getter Rectifier Tube USA 1953","description":"\u003cp\u003e\u003cstrong\u003e6X5 GT ( 6Z5P ) GE NOS NIB Black Plates Square Getter Rectifier Tube MADE IN USA '53\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"438\"\u003eThe \u003cstrong data-start=\"72\" data-end=\"80\"\u003e1953\u003c\/strong\u003e \u003cstrong data-start=\"35\" data-end=\"67\"\u003e6X5GT (6Z5P) GE Black Plates\u003c\/strong\u003e , with \u003cstrong data-start=\"86\" data-end=\"103\"\u003eSquare Getter\u003c\/strong\u003e , is a high quality rectifier, designed to provide \u003cstrong data-start=\"172\" data-end=\"207\"\u003estable and clean rectification\u003c\/strong\u003e . Although it does not directly affect the timbre like a signal tube, its ability to provide a \u003cstrong data-start=\"316\" data-end=\"362\"\u003ewell-regulated and fluctuation-free voltage\u003c\/strong\u003e is reflected in the \u003cstrong data-start=\"381\" data-end=\"435\"\u003edynamics and transparency of the overall sound\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cul data-start=\"440\" data-end=\"1036\"\u003e\n\u003cli data-start=\"440\" data-end=\"597\"\u003e\u003cstrong data-start=\"442\" data-end=\"451\"\u003eBass\u003c\/strong\u003e : \u003cstrong data-start=\"453\" data-end=\"480\"\u003eSolid and well-articulated\u003c\/strong\u003e , with a clean response that avoids excessive bloat, maintaining excellent control of the low frequencies.\u003c\/li\u003e\n\u003cli data-start=\"598\" data-end=\"740\"\u003e\u003cstrong data-start=\"600\" data-end=\"608\"\u003eMedium\u003c\/strong\u003e : \u003cstrong data-start=\"610\" data-end=\"634\"\u003eNeutral and transparent\u003c\/strong\u003e , with a clear and natural presentation, without artificial colorations that could alter the timbre.\u003c\/li\u003e\n\u003cli data-start=\"741\" data-end=\"890\"\u003e\u003cstrong data-start=\"743\" data-end=\"751\"\u003eHighs\u003c\/strong\u003e : \u003cstrong data-start=\"753\" data-end=\"780\"\u003eHarmonious and detailed\u003c\/strong\u003e , with a sweet and harsh extension, contributing to a balanced and never fatiguing sound reproduction.\u003c\/li\u003e\n\u003cli data-start=\"891\" data-end=\"1036\"\u003e\u003cstrong data-start=\"893\" data-end=\"905\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"907\" data-end=\"928\"\u003eSmooth and natural\u003c\/strong\u003e , with transient management that gives a sense of stability and coherence to the amplifier.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1038\" data-end=\"1370\"\u003eThe \u003cstrong data-start=\"1065\" data-end=\"1073\"\u003e1953\u003c\/strong\u003e \u003cstrong data-start=\"1041\" data-end=\"1060\"\u003eGE Black Plates\u003c\/strong\u003e , thanks to their \u003cstrong data-start=\"1092\" data-end=\"1156\"\u003esolid construction and extremely clean rectification\u003c\/strong\u003e , are particularly suitable for \u003cstrong data-start=\"1197\" data-end=\"1244\"\u003ehi-fi systems and instrument amplifiers\u003c\/strong\u003e , where a \u003cstrong data-start=\"1264\" data-end=\"1291\"\u003econstant and well-regulated\u003c\/strong\u003e voltage is essential to obtain a \u003cstrong data-start=\"1322\" data-end=\"1367\"\u003enatural and balanced sound reproduction\u003c\/strong\u003e .\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 60V ; Vf = 6.3V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 52 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 53 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 53 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Excellent – Perfectly preserved writing, minimal signs of wear. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 3-39 - 39th week of 1953\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":54040609423708,"sku":"02776Y","price":24.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_4430d619-3ac5-48be-b2af-16b71c95345d.jpg?v=1740407681"},{"product_id":"5y4-g-nu-national-union-black-plates-foil-getter-rectifier-made-in-usa","title":"5Y4G NOS NIB NU National Union – Black Plates Foil Getter Rectifier Tube USA 1950s","description":"\u003cp\u003e\u003cstrong\u003e5Y4 G NU NATIONAL UNION NOS NIB Black Plates Foil Getter Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"742\" data-start=\"208\"\u003eThe \u003cstrong data-end=\"234\" data-start=\"211\"\u003e5Y4G National Union\u003c\/strong\u003e , in this rare \u003cstrong data-end=\"271\" data-start=\"260\"\u003eNOS NIB\u003c\/strong\u003e version from the 1950s with \u003cstrong data-end=\"319\" data-start=\"301\"\u003eST bottle\u003c\/strong\u003e structure, compact \u003cstrong data-end=\"337\" data-start=\"321\"\u003eblack plates\u003c\/strong\u003e and \u003cstrong data-end=\"381\" data-start=\"349\"\u003edisc getter (foil getter)\u003c\/strong\u003e , is a \u003cstrong data-end=\"448\" data-start=\"428\"\u003elow current\u003c\/strong\u003e direct-heated rectifier, electrically similar to the 5Y3G but with a different pinout. Made in the United States by \u003cstrong data-end=\"549\" data-start=\"543\"\u003eNU\u003c\/strong\u003e , a company known for the quality of its industrial and military tubes, it represents a choice of \u003cstrong data-end=\"675\" data-start=\"647\"\u003egreat tonal coherence\u003c\/strong\u003e for audio systems with a vintage character or for philological restorations.\u003c\/p\u003e\n\u003cp data-end=\"1027\" data-start=\"744\"\u003eThis valve is distinguished by its \u003cstrong data-end=\"812\" data-start=\"783\"\u003eprogressive behavior\u003c\/strong\u003e , \u003cstrong data-end=\"840\" data-start=\"817\"\u003erobust construction\u003c\/strong\u003e and \u003cstrong data-end=\"870\" data-start=\"846\"\u003erelaxed musicality\u003c\/strong\u003e , particularly appreciated in \u003cstrong data-end=\"948\" data-start=\"902\"\u003elow-power single-ended amplifiers\u003c\/strong\u003e , valve preamplifiers and power supplies of vintage hi-fi radios.\u003c\/p\u003e\n\u003cp data-end=\"1262\" data-start=\"1034\"\u003e\u003cstrong data-end=\"1043\" data-start=\"1034\"\u003eBass\u003c\/strong\u003e : soft and controlled. The low range is \u003cstrong data-end=\"1113\" data-start=\"1085\"\u003emore rounded than deep\u003c\/strong\u003e , with excellent integration into the overall musical message. Where authority is needed, it offers \u003cstrong data-end=\"1246\" data-start=\"1213\"\u003estable and harmonious pulsation\u003c\/strong\u003e , never intrusive.\u003c\/p\u003e\n\u003cp data-end=\"1521\" data-start=\"1264\"\u003e\u003cstrong data-end=\"1272\" data-start=\"1264\"\u003eMids\u003c\/strong\u003e : natural and musical. The mids are \u003cstrong data-end=\"1338\" data-start=\"1319\"\u003efluid and sober\u003c\/strong\u003e , with \u003cstrong data-end=\"1376\" data-start=\"1344\"\u003ea well-articulated central voice\u003c\/strong\u003e and a sonic presence that favors \u003cstrong data-end=\"1443\" data-start=\"1413\"\u003ecoherence and organicity\u003c\/strong\u003e over analyticity. Excellent performance with acoustic instruments and male voices.\u003c\/p\u003e\n\u003cp data-end=\"1777\" data-start=\"1523\"\u003e\u003cstrong data-end=\"1531\" data-start=\"1523\"\u003eHighs\u003c\/strong\u003e : delicate and velvety. The high range is \u003cstrong data-end=\"1581\" data-start=\"1571\"\u003esilky\u003c\/strong\u003e , with a \u003cstrong data-end=\"1619\" data-start=\"1591\"\u003econtrolled brilliance\u003c\/strong\u003e and free from harshness. The details emerge \u003cstrong data-end=\"1688\" data-start=\"1665\"\u003egradually and gracefully\u003c\/strong\u003e , without ever exceeding in definition, contributing to a soft and engaging listening experience.\u003c\/p\u003e\n\u003cp data-end=\"2037\" data-start=\"1779\"\u003e\u003cstrong data-end=\"1791\" data-start=\"1779\"\u003eDynamics\u003c\/strong\u003e : smooth and predictable. The transient response is \u003cstrong data-end=\"1871\" data-start=\"1843\"\u003elinear and unhurried\u003c\/strong\u003e , ideal for contexts where \u003cstrong data-end=\"1926\" data-start=\"1898\"\u003emusicality and naturalness\u003c\/strong\u003e are preferred to dry or rapid impacts. Particularly suitable for intimate genres and acoustic reproductions.\u003c\/p\u003e\n\u003cp data-end=\"2277\" data-start=\"2039\"\u003e\u003cstrong data-end=\"2053\" data-start=\"2039\"\u003eSoundstage\u003c\/strong\u003e : Coherent and compact. The stereo image is \u003cstrong data-end=\"2115\" data-start=\"2096\"\u003ewell focused\u003c\/strong\u003e , with \u003cstrong data-end=\"2146\" data-start=\"2121\"\u003erealistic depth\u003c\/strong\u003e and \u003cstrong data-end=\"2177\" data-start=\"2149\"\u003ecredible positioning\u003c\/strong\u003e . The soundstage tends to be \u003cstrong data-end=\"2234\" data-start=\"2217\"\u003emore contained\u003c\/strong\u003e , but rich in nuance and environmental details.\u003c\/p\u003e\n\u003cp data-end=\"2665\" data-start=\"2284\"\u003e🎧 \u003cstrong data-end=\"2344\" data-start=\"2287\"\u003eUse in Headphone Amplifiers and Driver Stages Hi-Fi\u003c\/strong\u003e \u003cbr data-end=\"2347\" data-start=\"2344\"\u003eThis 5Y4G is ideal for \u003cstrong data-end=\"2415\" data-start=\"2371\"\u003elow-current tube power supplies\u003c\/strong\u003e , especially in systems that require \u003cstrong data-end=\"2507\" data-start=\"2457\"\u003estability, silence and natural timbre\u003c\/strong\u003e . Perfect with sensitive headphones such as \u003cstrong data-end=\"2557\" data-start=\"2544\"\u003ethe Grado RS1\u003c\/strong\u003e , \u003cstrong data-end=\"2573\" data-start=\"2559\"\u003eZMF Aeolus\u003c\/strong\u003e or \u003cstrong data-end=\"2596\" data-start=\"2576\"\u003eSennheiser HD650\u003c\/strong\u003e , where it enhances microdynamics without ever going overboard in brightness.\u003c\/p\u003e\n\u003cp data-end=\"3014\" data-start=\"2667\"\u003e🎸 \u003cstrong data-end=\"2715\" data-start=\"2670\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e \u003cbr data-end=\"2718\" data-start=\"2715\"\u003eRarer in guitar circuits than other rectifiers, but ideal for \u003cstrong data-end=\"2854\" data-start=\"2802\"\u003esmall vintage combos or low-wattage custom amps\u003c\/strong\u003e , where it delivers a \u003cstrong data-end=\"2913\" data-start=\"2882\"\u003esweet, compressed, organic\u003c\/strong\u003e sound with \u003cstrong data-end=\"2944\" data-start=\"2919\"\u003enatural sag\u003c\/strong\u003e and \u003cstrong data-end=\"2973\" data-start=\"2947\"\u003emellow dynamic touch\u003c\/strong\u003e , perfect for traditional jazz and blues.\u003c\/p\u003e\n\u003cp data-end=\"3409\" data-start=\"3016\"\u003e🎯 \u003cstrong data-end=\"3051\" data-start=\"3019\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr data-end=\"3054\" data-start=\"3051\"\u003eA tube with \u003cstrong data-end=\"3097\" data-start=\"3072\"\u003ea calm and coherent voice\u003c\/strong\u003e , ideal for those looking for \u003cstrong data-end=\"3166\" data-start=\"3122\"\u003etransparency of timbre without fatigue\u003c\/strong\u003e and a reliable electrical base. In \u003cstrong data-end=\"3247\" data-start=\"3218\"\u003eNOS configuration with original box\u003c\/strong\u003e , it also represents a \u003cstrong data-end=\"3310\" data-start=\"3271\"\u003esmart collector's choice\u003c\/strong\u003e , especially in restorations that require authentic first-generation American components.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5.0V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 92 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 101 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 93 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003c\/span\u003e \u003cmeta charset=\"utf-8\"\u003eStandard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and working - In original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Excellent – Perfectly preserved writing, minimal signs of wear. See photos. The original packaging is very compromised.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e JR -\u003cmeta charset=\"utf-8\"\u003e Code not decipherable. Year of manufacture detected by internal structure. Manufactured in the 1950s.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"NATIONAL UNION","offers":[{"title":"Default Title","offer_id":54041406177628,"sku":"02779M","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_087640a9-5cc5-41e6-8f8d-c21539391dd8.jpg?v=1740417967"},{"product_id":"5u4gb-5as4a-rca-black-plates-tested-tube-top-side-square-getter-rectifier-made-in-usa-60s","title":"5U4GB 5AS4A RCA Black Plates Tall Bottle Tested Tube Top Side Square Getter Rectifier Made in USA '60s","description":"\u003cp\u003e\u003cstrong\u003e5U4GB 5AS4A RCA Black Plates Tall Bottle Tested Tube Top Side Square Getter Rectifier Made in USA '60s\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eNote: This unit has a visible chip on the Bakelite base, as shown in the photographs. This is purely cosmetic and does not affect the valve's function, safety, electrical performance, or sonic accuracy. The price fully reflects the aesthetic condition described above.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp data-end=\"671\" data-start=\"196\"\u003e The \u003cstrong data-end=\"220\" data-start=\"199\"\u003e5U4GB \/ 5AS4A RCA\u003c\/strong\u003e , in this \u003cstrong data-end=\"256\" data-start=\"241\"\u003eTall Bottle\u003c\/strong\u003e version with \u003cstrong data-end=\"277\" data-start=\"261\"\u003eblack plates\u003c\/strong\u003e and \u003cstrong data-end=\"299\" data-start=\"280\"\u003esquare getter\u003c\/strong\u003e in the \u003cstrong data-end=\"337\" data-start=\"313\"\u003eupper and lateral\u003c\/strong\u003e position, represents one of the most robust and balanced rectifiers of the American production of the 60s. \u003cbr data-end=\"440\" data-start=\"437\"\u003eThe tall bottle is often associated with greater thermal dissipation and a more generous construction, useful for ensuring \u003cstrong data-end=\"670\" data-start=\"581\"\u003ereliability and stability even in prolonged or high current demand applications\u003c\/strong\u003e .\u003c\/p\u003e\n\n\u003cp data-end=\"949\" data-start=\"673\"\u003e \u003cstrong data-end=\"682\" data-start=\"673\"\u003eBass\u003c\/strong\u003e : Solid and well-controlled. The low range is notable for its firmness and articulation, without ever becoming intrusive. The power control provides a compact and coherent sound base, essential for systems that focus on detail and dynamics.\u003c\/p\u003e\n\n\u003cp data-end=\"1205\" data-start=\"951\"\u003e \u003cstrong data-end=\"959\" data-start=\"951\"\u003eMids\u003c\/strong\u003e : Natural, tidy, and slightly restrained. Voices integrate precisely into the soundscape, without unnatural projection. The typical RCA mids are recognized for their clarity and transparency, which are also very present in this tall bottle version.\u003c\/p\u003e\n\n \u003cp data-end=\"1414\" data-start=\"1207\"\u003e\u003cstrong data-end=\"1215\" data-start=\"1207\"\u003eHighs\u003c\/strong\u003e : Clean and silky. The high-range response is measured, never exuberant. Details emerge without harshness, with a restrained brilliance that enhances musicality and reduces listening fatigue.\u003c\/p\u003e\n\n\u003cp data-end=\"1640\" data-start=\"1416\"\u003e \u003cstrong data-end=\"1428\" data-start=\"1416\"\u003eDynamics\u003c\/strong\u003e : Wide and smooth. The valve consistently follows both micro-variations and the most energetic transients, without introducing compression or instability. Behavior under load is progressive and well-controlled.\u003c\/p\u003e\n\n\u003cp data-end=\"1878\" data-start=\"1642\"\u003e \u003cstrong data-end=\"1656\" data-start=\"1642\"\u003eSoundstage\u003c\/strong\u003e : Wide and cohesive. The soundstage is stable and well-layered, with balanced spatial distribution and good depth, suitable for systems that aim for transparent but not overly analytical performance.\u003c\/p\u003e\n\n\u003cp data-end=\"2210\" data-start=\"1880\"\u003e 🎧 \u003cstrong data-end=\"1940\" data-start=\"1883\"\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e \u003cbr data-end=\"1943\" data-start=\"1940\"\u003eIdeal for tube preamps, tube DACs, and OTL amplifiers, where power control is crucial to achieving stable, clean, and three-dimensional sound. The Tall Bottle structure provides a useful power reserve for demanding configurations.\u003c\/p\u003e\n\n\u003cp data-end=\"2591\" data-start=\"2212\"\u003e 🎸 \u003cstrong data-end=\"2260\" data-start=\"2215\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"2263\" data-start=\"2260\"\u003e This RCA version is used in vintage American amplifiers (e.g., \u003cstrong data-end=\"2350\" data-start=\"2329\"\u003eFender Bandmaster\u003c\/strong\u003e , \u003cstrong data-end=\"2368\" data-start=\"2352\"\u003eSuper Reverb\u003c\/strong\u003e , \u003cstrong data-end=\"2381\" data-start=\"2370\"\u003eShowman\u003c\/strong\u003e ) where the rectifier response directly affects feel and articulation. It offers progressive tube compression, with well-managed headroom and an excellent balance between detail and warmth.\u003c\/p\u003e\n\n\u003cp data-end=\"2923\" data-start=\"2593\"\u003e 🎯 \u003cstrong data-end=\"2628\" data-start=\"2596\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr data-end=\"2631\" data-start=\"2628\"\u003eA \u003cstrong data-end=\"2698\" data-start=\"2650\"\u003ereliable, balanced, and musically restrained\u003c\/strong\u003e rectifier, featuring Tall Bottle construction for superior heat dissipation and stable response even in professional or high-current settings. A perfect choice for systems requiring consistency, neutrality, and control.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003cstrong\u003eTubes Tested\u003c\/strong\u003e on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 100V, Vf = 5V \u003cstrong\u003e\u003cbr\u003eGood from:\u003c\/strong\u003e Ia = 78 mA \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Ia = 120 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Ia = 139 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Ia = 125 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOperation:\u003c\/strong\u003e Stable valve, quiet in operation, and suitable for regular and controlled power supply. Tested with a Funke W19 tester.\u003c\/li\u003e\n\n \u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eFair – All writing is completely gone, with obvious signs of wear and a chip on the plastic base. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eAbsent - Made by RCA USA -\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eYear of manufacture missing, detected by the internal structure.\u003cmeta charset=\"utf-8\"\u003e Made in the early 1960s.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003e\n\u003ca rel=\"noopener\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":54729654075740,"sku":"02965","price":54.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_7b996b57-aa26-4e51-9ec3-20de25d99cd7.jpg?v=1749632368"},{"product_id":"5u4gb-5as4a-nos-rca-black-plates-matched-pair-tubes-top-side-halo-getter-rectifiers-made-in-usa-60s-copia","title":"5U4GB 5AS4A RCA Black Plates Tube Top Side Square Getter Rectifier Made in USA '64","description":"\u003cp\u003e \u003cstrong\u003e5U4GB 5AS4A Baldwin by RCA Black Plates Tube Top Side Square Getter Rectifier Made in USA '64\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e \u003cem\u003eNote: Price refers to one selected valve\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e The \u003cstrong\u003e5U4GB \/ 5AS4A Baldwin by RCA\u003c\/strong\u003e , in this 1964 version with \u003cstrong\u003eblack plates\u003c\/strong\u003e , \u003cstrong\u003esquare getter\u003c\/strong\u003e in the \u003cstrong\u003etop and side\u003c\/strong\u003e position, represents one of the most stable and balanced variants of the classic RCA rectifier, selected for the organ sector but fully compatible with high-end audio use.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eBass\u003c\/strong\u003e : precise and controlled. The bass extension is solid but never intrusive, with a tight and coherent response even under complex loads. The bass structure contributes to rhythmic stability without introducing inaccuracies or bloat.\u003c\/p\u003e\n\n \u003cp\u003e\u003cstrong\u003eMids\u003c\/strong\u003e : Clean and well-articulated. The midrange is presented in a neutral and uncluttered manner, with particular attention to the tonal coherence of vocals and acoustic instruments. There is no tendency to harden or thin out, which favors the overall balance.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eHighs\u003c\/strong\u003e : Sober and natural. The high range is well-integrated, without excessive brightness or obvious grain. Detail is present but never invasive, leaving room for musicality and reducing listening fatigue even during prolonged listening.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eDynamics\u003c\/strong\u003e : linear and stable. Transient response is smooth, with predictable and well-balanced behavior even under variable load conditions. No \"pumping\" effect, just an organic dynamic progression.\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eSoundstage\u003c\/strong\u003e : Coherent and well-structured. The stereo image is clear and stable, with good definition of the soundstage. The soundstage develops naturally in depth and width, without forced expansion.\u003c\/p\u003e\n\n \u003cp\u003e🎧 \u003cstrong\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\u003cbr\u003e Perfect for tube DACs and reference preamps, this tube offers clean delivery and extremely low noise. Its tonal balance and transparency are ideal for enhancing microdynamics and depth with demanding headphones like \u003cstrong\u003ethe Focal Utopia\u003c\/strong\u003e , \u003cstrong\u003eSennheiser HD800S\u003c\/strong\u003e , and \u003cstrong\u003eZMF Atrium\u003c\/strong\u003e .\u003c\/p\u003e\n\n\u003cp\u003e 🎸 \u003cstrong\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003cbr\u003e Often installed in \u003cstrong\u003evintage Fender\u003c\/strong\u003e amplifiers (such as the Twin Reverb, Bandmaster and Showman) and their boutique derivatives, this rectifier provides \u003cstrong\u003enatural progressive compression\u003c\/strong\u003e , with a \u003cstrong\u003econtrolled musical sag\u003c\/strong\u003e , perfect for cleans, blues and the dynamic crunch typical of the 60s American sound.\u003c\/p\u003e\n\n\u003cp\u003e 🎯 \u003cstrong\u003eNote for audiophiles and technicians\u003c\/strong\u003e \u003cbr\u003eA technically robust and musically neutral tube, ideal for those looking for a stable, silent and reliable electric base.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003cstrong\u003eTubes Tested\u003c\/strong\u003e on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 100V, Vf = 5V \u003cstrong\u003e\u003cbr\u003eGood from:\u003c\/strong\u003e Ia = 78 mA \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Ia = 120 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 1\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Ia = 123 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Ia = 123 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 2\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Ia = 124 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Ia = 120 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOperation:\u003c\/strong\u003e Stable valve, quiet in operation, and suitable for regular and controlled power supply. Tested with a Funke W19 tester.\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\n\u003c\/li\u003e\n\n \u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e \u003cspan\u003eVery good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e64-25 - Made by RCA USA - 25th week of 1964\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":54731741299036,"sku":"02967U","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/14.jpg?v=1769276023"},{"product_id":"5v4g-gz32-zenith-st-shape-black-plates-bottom-foil-dimpled-getter-tested-tube-made-in-usa-50s","title":"5V4G GZ32 ZENITH Black Plates Bottom Foil Dimpled Getter Tested Tube Made in USA '50s","description":"\u003ch3\u003e\u003cstrong\u003e5V4G GZ32 ZENITH Black Plates Bottom Foil Dimpled Getter Tested Tube Made in USA '50s\u003c\/strong\u003e\u003c\/h3\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"617\" data-start=\"209\"\u003eThe \u003cstrong data-end=\"234\" data-start=\"212\"\u003e5V4G \/ GZ32 Zenith\u003c\/strong\u003e, produced in the United States in the 1950s and presented here in the classic configuration with \u003cstrong data-end=\"356\" data-start=\"340\"\u003eblack plates\u003c\/strong\u003e, \u003cstrong data-end=\"384\" data-start=\"358\"\u003edimpled foil getter\u003c\/strong\u003e in the \u003cstrong data-end=\"411\" data-start=\"398\"\u003ebottom\u003c\/strong\u003e position, and a robust internal structure, represents one of the most musical and stable interpretations among American rectifier tubes of those years, likely manufactured by \u003cstrong data-end=\"596\" data-start=\"578\"\u003eRCA or Sylvania\u003c\/strong\u003e on behalf of Zenith.\u003c\/p\u003e\n\u003cp data-end=\"940\" data-start=\"619\"\u003eAppreciated for its \u003cstrong data-end=\"673\" data-start=\"641\"\u003elower voltage drop\u003c\/strong\u003e compared to the 5U4G and for its \u003cstrong data-end=\"725\" data-start=\"702\"\u003enatural soft start\u003c\/strong\u003e, this tube is particularly suitable for \u003cstrong data-end=\"828\" data-start=\"773\"\u003etube preamplifiers, integrated amplifiers\u003c\/strong\u003e, and \u003cstrong data-end=\"853\" data-start=\"831\"\u003ehi-fi driver stages\u003c\/strong\u003e that benefit from well-regulated voltage and a progressive power-on curve.\u003c\/p\u003e\n\u003cp data-end=\"1209\" data-start=\"947\"\u003e\u003cstrong data-end=\"956\" data-start=\"947\"\u003eBass\u003c\/strong\u003e: articulated and harmonic. The low-frequency response is warmer and rounder than the 5U4GB, with less deep but more \"musical\" extension. Ideal for systems seeking \u003cstrong data-end=\"1167\" data-start=\"1142\"\u003edensity and naturalness\u003c\/strong\u003e rather than impact and rigid control.\u003c\/p\u003e\n\u003cp data-end=\"1470\" data-start=\"1211\"\u003e\u003cstrong data-end=\"1219\" data-start=\"1211\"\u003eMids\u003c\/strong\u003e: sweet and harmonious. The tonal heart of this tube lies in the mid-frequencies, which are \u003cstrong data-end=\"1355\" data-start=\"1321\"\u003evelvety, organic, and light\u003c\/strong\u003e, with a particularly charming vocal rendition. Perfect for jazz, chamber classical, and acoustic reproductions.\u003c\/p\u003e\n\u003cp data-end=\"1726\" data-start=\"1472\"\u003e\u003cstrong data-end=\"1480\" data-start=\"1472\"\u003eHighs\u003c\/strong\u003e: silky and delicate. The upper part of the spectrum develops gracefully, without forcing. Detail is present but never aggressive, with a \u003cstrong data-end=\"1634\" data-start=\"1620\"\u003efine grain\u003c\/strong\u003e that enhances micro-information and contributes to a refined and non-fatiguing listening experience.\u003c\/p\u003e\n\u003cp data-end=\"1999\" data-start=\"1728\"\u003e\u003cstrong data-end=\"1740\" data-start=\"1728\"\u003eDynamics\u003c\/strong\u003e: soft but coherent. The dynamic behavior is more \"elastic\" compared to low-internal resistance rectifiers like the GZ34, but precisely for this reason, it is more musical in low-power systems, with a \u003cstrong data-end=\"1998\" data-start=\"1952\"\u003egentle transition between energy levels\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-end=\"2217\" data-start=\"2001\"\u003e\u003cstrong data-end=\"2015\" data-start=\"2001\"\u003eSoundstage\u003c\/strong\u003e: wide and enveloping. The soundstage develops with \u003cstrong data-end=\"2103\" data-start=\"2069\"\u003edepth and a sense of ambiance\u003c\/strong\u003e, revealing natural reverberations and spatial information that make the stage credible and immersive.\u003c\/p\u003e\n\u003cp data-end=\"2593\" data-start=\"2224\"\u003e🎧 \u003cstrong data-end=\"2284\" data-start=\"2227\"\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\u003cbr data-end=\"2287\" data-start=\"2284\"\u003eThe 5V4G Zenith is particularly suited for refined, low-power systems where it can best express its \u003cstrong data-end=\"2434\" data-start=\"2411\"\u003etonal refinement\u003c\/strong\u003e and its \u003cstrong data-end=\"2485\" data-start=\"2440\"\u003eability to promote three-dimensionality\u003c\/strong\u003e. Ideal for tube DACs, power supplies for line stages, and high-sensitivity headphone amplifiers.\u003c\/p\u003e\n\u003cp data-end=\"2920\" data-start=\"2595\"\u003e🎸 \u003cstrong data-end=\"2643\" data-start=\"2598\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"2646\" data-start=\"2643\"\u003eLess common in guitar applications than the 5U4G or GZ34, but perfect for \u003cstrong data-end=\"2763\" data-start=\"2736\"\u003elow-power vintage amps\u003c\/strong\u003e or \u003cstrong data-end=\"2788\" data-start=\"2766\"\u003estudio guitars\u003c\/strong\u003e, where a \u003cstrong data-end=\"2822\" data-start=\"2804\"\u003esweet response\u003c\/strong\u003e, \u003cstrong data-end=\"2849\" data-start=\"2824\"\u003egradual musical sag\u003c\/strong\u003e, and \u003cstrong data-end=\"2886\" data-start=\"2852\"\u003enatural harmonic transitions\u003c\/strong\u003e with well-controlled compression are desired.\u003c\/p\u003e\n\u003cp data-end=\"3257\" data-start=\"2922\"\u003e🎯 \u003cstrong data-end=\"2957\" data-start=\"2925\"\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003cbr data-end=\"2960\" data-start=\"2957\"\u003eA tube with a \u003cstrong data-end=\"3011\" data-start=\"2972\"\u003epoetic and transparent character\u003c\/strong\u003e, suitable for high-sensitivity systems and for those who desire a \u003cstrong data-end=\"3119\" data-start=\"3085\"\u003emore analog and less analytical\u003c\/strong\u003e reproduction. Its classic structure and black plates also make it an aesthetically fascinating choice for vintage restorations or custom builds.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTubes Tested\u003c\/strong\u003e on\u003cstrong\u003e Funke W19 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 60V, Vf = 5V\u003cstrong\u003e\u003cbr\u003eGood from:\u003c\/strong\u003e Ia = 55 mA\u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003c\/strong\u003e Ia = 84.6 mA\u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1\u003c\/strong\u003e: Ia = 60 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Ia = 61 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Stable tube, quiet in operation, and suitable for regular and controlled power supply. Test performed with Funke W19 tester.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Tube - Tested and perfectly functional. Supplied in our custom box for optimal protection. \u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e Very Good – Legible lettering with slight signs of age, no obvious defects. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003eM-R - \u003cmeta charset=\"utf-8\"\u003eCode not decipherable. Manufacturing year determined by internal structure. 1950s manufacturing.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"ZENITH","offers":[{"title":"Default Title","offer_id":54736746316124,"sku":"02968U","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_aeb7d074-41ed-4529-8416-51eb7065470d.jpg?v=1749720152"},{"product_id":"5v4g-gz32-rca-st-shape-black-plates-bottom-square-getter-tested-tube-made-in-usa","title":"5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58","description":"\u003cp\u003e\u003cstrong\u003e5V4G GZ32 RCA ST Shape Black Plates Bottom Square Getter Tested Tube Made in USA '58\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e5V4G \/ GZ32 RCA\u003c\/strong\u003e, in this refined 1958 version with \u003cstrong\u003eST bottle\u003c\/strong\u003e, \u003cstrong\u003esymmetrical black plates\u003c\/strong\u003e, and \u003cstrong\u003ebottom square getter\u003c\/strong\u003e, represents one of the most balanced and musical options among classic American rectifiers for hi-fi applications. Built with the care typical of RCA’s golden years, it combines \u003cstrong\u003eelectrical robustness, low noise operation, and refined tonal performance\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eEspecially appreciated in systems with sensitive power supplies or vintage integrated amplifiers, this tube is ideal for those seeking \u003cstrong\u003estable voltage\u003c\/strong\u003e, \u003cstrong\u003esmooth startup\u003c\/strong\u003e, and a sound output that preserves the natural character of the audio signal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBass\u003c\/strong\u003e: tight and extended. The low-end response is more precise and defined compared to other contemporary 5V4G models, with good hold even under dynamic load conditions. It delivers \u003cstrong\u003efirm and musical bass\u003c\/strong\u003e, capable of authoritatively supporting the harmonic foundation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMidrange\u003c\/strong\u003e: transparent and neutral. The mid frequencies are \u003cstrong\u003edry but not cold\u003c\/strong\u003e, with excellent vocal clarity and a natural rendering of acoustic instruments. No tonal coloration, just a clarity that enhances the system’s timbral coherence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighs\u003c\/strong\u003e: open and discreet. The top end extends with \u003cstrong\u003efineness and control\u003c\/strong\u003e, without harshness or roughness. Details emerge with \u003cstrong\u003erefinement\u003c\/strong\u003e, revealing micro-information without ever becoming intrusive.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDynamics\u003c\/strong\u003e: fluid and responsive. The tube \u003cstrong\u003etracks transients well\u003c\/strong\u003e, with energetic yet never edgy behavior. The dynamic response is \u003cstrong\u003elinear and progressive\u003c\/strong\u003e, enhancing both delicate passages and those requiring more energy.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoundstage\u003c\/strong\u003e: well-organized and deep. The stereo image is \u003cstrong\u003estable, centered, and coherent\u003c\/strong\u003e, with good layering and a three-dimensional presentation that respects the spatial integrity of the music.\u003c\/p\u003e\n\u003cp\u003e🎧\u0026nbsp;\u003cstrong\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\u003cbr\u003eIdeal for tube preamps, DACs with tube rectification, or headphone amps with medium-high impedance. Thanks to its \u003cstrong\u003eelectrical transparency\u003c\/strong\u003e and \u003cstrong\u003elow noise emission\u003c\/strong\u003e, this tube performs without introducing coloration, enhancing detail and microdynamics even in reference-grade systems.\u003c\/p\u003e\n\u003cp\u003e🎸 \u003cstrong\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003cbr\u003eOccasionally used in \u003cstrong\u003emid-range American amps from the 1950s\u003c\/strong\u003e, this 5V4G contributes to a \u003cstrong\u003esoft and musical sag\u003c\/strong\u003e, with a non-aggressive dynamic response. Ideal for jazz, blues, studio cleans, and genres that favor \u003cstrong\u003enatural compression and controlled attack\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e🎯 \u003cstrong\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003cbr\u003eA \u003cstrong\u003ebalanced and uncompromising\u003c\/strong\u003e tube, perfect for those seeking a rectifier that is \u003cstrong\u003etransparent, stable, and technically flawless\u003c\/strong\u003e. The ST design with bottom square getter and symmetrical black plates also makes it a \u003cstrong\u003epremium choice for vintage restorations\u003c\/strong\u003e, both sonically and aesthetically.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTube tested\u003c\/strong\u003e on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003c\/strong\u003e Va = 60V, Vf = 5V\u003cbr\u003e\u003cstrong\u003eGood from:\u003c\/strong\u003e Ia = 55 mA\u003cbr\u003e\u003cstrong\u003e100% Average:\u003c\/strong\u003e Ia = 84.6 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT:\u003c\/strong\u003e VERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube Readings:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1\u003c\/strong\u003e: Ia = 82 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e: Ia = 80 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low Noise \u0026amp; Microphonics – Tested and suitable for hi-fi systems and guitar amps.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, no fluctuations.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e None.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tube – Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully operational.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Very Good – Legible print with minor signs of age, some smearing on the logo silkscreen. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFactory Code:\u003c\/strong\u003e K2 – RCA Manufacturing. March-April 1958.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":54737030316380,"sku":"02969U","price":74.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_2efd1100-0d75-4d3f-8a5c-1dffb00c8253.jpg?v=1749722152"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/collections\/rectifier-tubes-926857.jpg?v=1657112582","url":"https:\/\/vacuumtubestreasures.com\/en-bg\/collections\/rectifier-tubes-en.oembed?page=2","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}