{"title":"Preamp Tubes","description":"","products":[{"product_id":"e88cc-6dj8-philips-heerlen-special-quality-o-getter-tube-gold-pin-made-in-holland","title":"E88CC ( 6922 ) PHILIPS Special Quality Halo Getter Tube Gold Pin Made in Holland '66","description":"\u003cp\u003e\u003cstrong\u003eE88CC ( 6922 ) PHILIPS Special Quality Halo Getter Gold Pin\u003cmeta charset=\"utf-8\"\u003e Tube\u003c\/strong\u003e \u003cstrong\u003eMade in Holland '66\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"0\" data-end=\"1013\"\u003eThe \u003cstrong data-start=\"33\" data-end=\"73\"\u003eE88CC (6922) PHILIPS Special Quality\u003c\/strong\u003e represents one of the highest quality versions of the noval double triode series developed for professional, audio and high-precision instrument applications.\u003cbr data-start=\"234\" data-end=\"237\"\u003eProduced in the \u003cstrong data-start=\"265\" data-end=\"296\"\u003ePHILIPS plant in Heerlen (Holland)\u003c\/strong\u003e in \u003cstrong data-start=\"301\" data-end=\"317\"\u003eJanuary 1966\u003c\/strong\u003e , this valve belongs to the \u003cstrong data-start=\"360\" data-end=\"384\"\u003eSQ (Special Quality)\u003c\/strong\u003e selection, made with criteria of long life, electrical stability and low microphonics, intended for critical uses in measuring instruments, broadcast equipment and high-end hi-fi preamplifiers. \u003cbr data-start=\"584\" data-end=\"587\" data-is-only-node=\"\"\u003eThe construction with \u003cstrong data-start=\"606\" data-end=\"624\"\u003egrey plates\u003c\/strong\u003e , \u003cstrong data-start=\"626\" data-end=\"643\"\u003ehalo getters\u003c\/strong\u003e and \u003cstrong data-start=\"646\" data-end=\"664\"\u003egold feet\u003c\/strong\u003e testifies to the Dutch company's attention to the reliability and purity of the electrical contact, reducing oxidation and improving signal transmission over time.\u003cbr data-start=\"841\" data-end=\"844\"\u003eThe specimen described here has been tested on \u003cstrong data-start=\"889\" data-end=\"910\"\u003eAmplitrex AT-1000\u003c\/strong\u003e with \u003cstrong data-start=\"925\" data-end=\"935\"\u003eSTRONG\u003c\/strong\u003e result, guarantee of full efficiency and linear behavior on both sections.\u003c\/p\u003e\n\u003cp data-start=\"1020\" data-end=\"1647\"\u003e\u003cstrong data-start=\"1022\" data-end=\"1048\"\u003eSound Characteristics\u003c\/strong\u003e\u003cbr data-start=\"1048\" data-end=\"1051\"\u003e\u003cstrong data-start=\"1051\" data-end=\"1061\"\u003eBass:\u003c\/strong\u003e precise, taut and quick in response, with excellent holding even in complex passages. \u003cbr data-start=\"1156\" data-end=\"1159\"\u003e\u003cstrong data-start=\"1159\" data-end=\"1168\"\u003eMids:\u003c\/strong\u003e silky, transparent, and natural; voices are present but never intrusive, with a typically “neutral” and musical timbre.\u003cbr data-start=\"1295\" data-end=\"1298\"\u003e\u003cstrong data-start=\"1298\" data-end=\"1307\"\u003eHighs:\u003c\/strong\u003e extended, bright, and free of harshness. The balance between detail and sweetness is exemplary, in the best Heerlen tradition.\u003cbr data-start=\"1436\" data-end=\"1439\"\u003e\u003cstrong data-start=\"1439\" data-end=\"1452\" data-is-only-node=\"\"\u003eDynamic:\u003c\/strong\u003e lively and proportionate, capable of rendering micro-contrasts with great fluidity.\u003cbr data-start=\"1534\" data-end=\"1537\"\u003e\u003cstrong data-start=\"1537\" data-end=\"1552\"\u003eSoundstage:\u003c\/strong\u003e wide, stable and three-dimensional, with excellent channel separation and depth of field.\u003c\/p\u003e\n\u003cp data-start=\"1654\" data-end=\"1978\"\u003e🎧 \u003cstrong data-start=\"1657\" data-end=\"1694\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003cbr data-start=\"1694\" data-end=\"1697\"\u003eIdeal for high-end preamplifiers, DACs, phono stages and driver circuits where neutrality and tonal accuracy are critical. \u003cbr data-start=\"1841\" data-end=\"1844\"\u003eExcellent compatibility with Conrad Johnson, Audio Research, Counterpoint, EAR, Copland, and other European school systems.\u003c\/p\u003e\n\u003cp data-start=\"1985\" data-end=\"2221\"\u003e🎸 \u003cstrong data-start=\"1988\" data-end=\"2021\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003cbr data-start=\"2021\" data-end=\"2024\"\u003eIt is also highly appreciated in professional tube preamplifiers and heads, where it offers a detailed and noise-free sound, with a perfect balance between clarity and harmonic warmth.\u003c\/p\u003e\n\u003cp data-start=\"2228\" data-end=\"2655\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e🎯 \u003cstrong data-start=\"2231\" data-end=\"2263\"\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003cbr data-start=\"2263\" data-end=\"2266\"\u003eThe acronym \u003cstrong data-start=\"2275\" data-end=\"2309\"\u003e“E88CC \/ 6922 Special Quality”\u003c\/strong\u003e identifies a long-life version (over 10,000 hours), with reinforced grille, gold-plated feet and selected tolerances. \u003cbr data-start=\"2431\" data-end=\"2434\"\u003eThe \u003cstrong data-start=\"2448\" data-end=\"2464\"\u003eHeerlen 1966\u003c\/strong\u003e production is among the most sought after for its sonic balance and impeccable construction, becoming a reference for those who want a \u003cstrong data-start=\"2605\" data-end=\"2654\"\u003etransparent, precise and musically refined\u003c\/strong\u003e valve.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eVa = 90V, Vg = -1.2V \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eGm = 12.5 ; Ia = 15 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValve\u003c\/strong\u003e :\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm = 11.0; Ia = 10.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 11.0; Ia = 10.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/div\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 Low. Tested and approved for use in hi-fi, phono stages, and guitar amplifiers, including V1.\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 tubes - Tested and in perfect working order. Shipped 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 \u003cspan\u003eGood – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 7LB ⊿6A3 → 7Lx indicates an E88CC with the sequential progression of x - ⊿6A3 ⊿ → Heerlen (Holland), 6 (out of four digits) → 1966 - A → January - 3 → 3rd week of the month\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\n\u003cp\u003e\u0026nbsp;\u003c\/p\u003e","brand":"PHILIPS","offers":[{"title":"Default Title","offer_id":42982811926775,"sku":"00711","price":124.5,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_0fab8742-607e-419c-9cbd-f3cfafee7d9c.jpg?v=1761579366"},{"product_id":"12at7-ecc81-ge-nos-nib-gray-plates-o-getter-tested-tube-made-in-usa","title":"12AT7 ( ECC81 ) GE NOS NIB Wing Gray Plates O Getter Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AT7 ( ECC81 ) GE NOS NIB Wing Gray Plates O Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eManufactured by GENERAL ELECTRIC in USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003e\u003cspan\u003eThese tubes offer a sound characterized by remarkable clarity and detail, with a well-balanced midrange and an airy, bright high-frequency extension. This gray-plated version has a slightly warm tone without losing definition, making it perfect for those seeking a balance between precision and musicality. Ideal for Hi-Fi audio and musical instruments, they ensure rich, detailed sound reproduction.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eWorn logos as shown in the photo\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e \u003cstrong\u003e\u003cspan\u003eTested on AVO VCM 163 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e \u003cspan\u003eVoltage Test: Va = 250V; Vg = -2V ; Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eAverage 100% Gm = 5.5 ; Ia = 10 mA\u003c\/span\u003e\u003cbr\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eSection 1: Gm = 5.6 ; Ia = 12 mA\u003cbr\u003e Section 2: Gm = 5.6 ; Ia = 13 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\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":"GE","offers":[{"title":"Default Title","offer_id":42983987183863,"sku":"00629","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12at7-ecc81-ge-nos-nib-gray-plates-o-getter-tested-tube-made-in-usa-981205.jpg?v=1657112617"},{"product_id":"12av7-ge-nos-nib-short-gray-plates-d-getter-tested-tube-made-in-usa-62","title":"12AV7 GE NOS NIB Short Gray Plates D Getter Tested Tube Made in USA '62","description":"\u003cp\u003e\u003cstrong\u003e12AV7 GE NOS NIB Short Gray Plates D Getter Tested Tube Made in USA '62\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e Description:\u003c\/h3\u003e\n\n\u003cp data-end=\"502\" data-start=\"84\"\u003e This \u003cstrong data-end=\"125\" data-start=\"91\"\u003e12AV7 General Electric NOS NIB\u003c\/strong\u003e , Made in USA and dating back to \u003cstrong data-end=\"158\" data-start=\"150\"\u003e1962\u003c\/strong\u003e , is a high quality signal tube, nowadays increasingly rare to find \u003cstrong data-end=\"259\" data-start=\"237\"\u003enew from stock\u003c\/strong\u003e and complete with the \u003cstrong data-end=\"298\" data-start=\"277\"\u003eoriginal box\u003c\/strong\u003e .\u003cbr data-end=\"302\" data-start=\"299\"\u003e The construction with \u003cstrong data-end=\"342\" data-start=\"321\"\u003eshort gray plates\u003c\/strong\u003e and \u003cstrong data-end=\"357\" data-start=\"345\"\u003eD getter\u003c\/strong\u003e is typical of the best GE productions of the early 60s, appreciated for their reliability, silence and stable electrical behavior over time.\u003c\/p\u003e\n\n\u003cp data-end=\"671\" data-start=\"504\"\u003e Tested in our laboratory, the valve is found to be \u003cstrong data-end=\"583\" data-start=\"555\"\u003eperfectly efficient\u003c\/strong\u003e , with consistent performance and ready for use in hi-fi equipment and vintage circuits.\u003c\/p\u003e\n\n\u003ch3 data-end=\"698\" data-start=\"678\"\u003e Sound Character\u003c\/h3\u003e\n\n \u003cp data-end=\"830\" data-start=\"700\"\u003e\u003cstrong data-end=\"709\" data-start=\"700\"\u003eBass\u003c\/strong\u003e\u003cbr data-end=\"712\" data-start=\"709\"\u003e Compact and well-controlled, with a quick, tidy response that contributes to a very clean overall balance.\u003c\/p\u003e\n\n\u003cp data-end=\"960\" data-start=\"832\"\u003e \u003cstrong data-end=\"840\" data-start=\"832\"\u003eMedium\u003c\/strong\u003e\u003cbr data-end=\"843\" data-start=\"840\"\u003e Clear, natural, and well-focused. Voices emerge with good presence and definition, without artificial coloration.\u003c\/p\u003e\n\n\u003cp data-end=\"1111\" data-start=\"962\"\u003e \u003cstrong data-end=\"970\" data-start=\"962\"\u003eHigh\u003c\/strong\u003e\u003cbr data-end=\"973\" data-start=\"970\"\u003e Harmonious and correctly extended, with a fine, never fatiguing grain. The tonal balance remains elegant even over prolonged listening sessions.\u003c\/p\u003e\n\n\u003cp data-end=\"1247\" data-start=\"1113\"\u003e \u003cstrong data-end=\"1125\" data-start=\"1113\"\u003eDynamics\u003c\/strong\u003e\u003cbr data-end=\"1128\" data-start=\"1125\"\u003e Responsive and fluid, with a good ability to follow signal variations while always maintaining control and stability.\u003c\/p\u003e\n\n\u003cp data-end=\"1368\" data-start=\"1249\"\u003e \u003cstrong data-end=\"1263\" data-start=\"1249\"\u003eSoundstage\u003c\/strong\u003e\u003cbr data-end=\"1266\" data-start=\"1263\"\u003e Neat and credible, with a well-structured soundstage and correct separation of instruments.\u003c\/p\u003e\n\n\u003ch3 data-end=\"1408\" data-start=\"1375\"\u003e 🎧 Use in Hi-Fi Amplifiers\u003c\/h3\u003e\n\n\u003cp data-end=\"1420\" data-start=\"1409\"\u003e Ideal for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"1460\" data-start=\"1423\"\u003e preamp stages and drivers\u003c\/li\u003e\n\n\u003cli data-end=\"1528\" data-start=\"1463\"\u003e Vintage amplifiers and American-inspired designs\u003c\/li\u003e\n\n \u003cli data-end=\"1604\" data-start=\"1531\"\u003esystems that prioritize clarity, balance, and operational reliability\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-end=\"1696\" data-start=\"1606\"\u003e A solid choice for those who want an uncommon but musically very consistent tube.\u003c\/p\u003e\n\n\u003ch3 data-end=\"1738\" data-start=\"1703\"\u003e 🎸 Use in Music Applications\u003c\/h3\u003e\n\n\u003cp data-end=\"1753\" data-start=\"1739\"\u003e Appreciated in:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"1806\" data-start=\"1756\"\u003e circuits for vintage instruments and equipment\u003c\/li\u003e\n\n\u003cli data-end=\"1887\" data-start=\"1809\"\u003e applications where stability, clean response and good dynamics are required\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-end=\"1965\" data-start=\"1889\"\u003e It offers a controlled, defined sound free from unpredictable behavior.\u003c\/p\u003e\n\n\u003ch3 data-end=\"2009\" data-start=\"1972\"\u003e 🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli data-end=\"2119\" data-start=\"2082\"\u003e Authentic GE Made in USA production\u003c\/li\u003e\n\n\u003cli data-end=\"2165\" data-start=\"2122\"\u003e true NOS condition with original box\u003c\/li\u003e\n\n\u003cli data-end=\"2213\" data-start=\"2168\"\u003e robust and historically correct construction\u003c\/li\u003e\n\n\u003cli data-end=\"2263\" data-start=\"2216\"\u003e balanced and reliable sound behavior \u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"2452\" data-start=\"2265\"\u003e A valve selected for those seeking \u003cstrong data-end=\"2356\" data-start=\"2303\"\u003evintage quality, tonal consistency and real value\u003c\/strong\u003e , not just a simple replacement but an authentic piece of the American electronic tradition.\u003c\/p\u003e\n\n\u003chr data-end=\"2265\" data-start=\"2262\"\u003e\n\n\u003cp\u003e Valves tested on \u003cstrong\u003eAmplitrex AT-1000\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTube tester:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 150V, Vg = -1V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n \u003cli\u003eAverage 100% Gm = 8.5 ; Ia = 18 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 Gm = 7.9 ; Ia = 14.6 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 8.9 ; Ia = 16.9 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 Low. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show a slight deviation in values; excellent for use in hi-fi and musical applications (guitar) where balanced sections are not specifically required.\u003c\/span\u003e\n\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\u003eCondition:\u003c\/strong\u003e \u003cspan\u003eNOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e \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\u003eExcellent – ​​Excellently preserved lettering, minimal signs of wear. 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\u003e-\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":"GE","offers":[{"title":"Default Title","offer_id":42986092331255,"sku":"00583","price":14.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12av7-ge-nos-nib-short-gray-plates-d-getter-tested-tube-made-in-usa-62-954667.jpg?v=1657112604"},{"product_id":"12ay7-rca-nos-nib-gray-plates-o-getter-tested-tubes-made-in-usa-2","title":"12AY7 RCA NOS Gray Plates Halo Getter AMPLITREX Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cstrong\u003e12AY7 RCA NOS Gray Plates Halo Getter AMPLITREX Tested Tube MADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"119\" data-end=\"524\"\u003eWe offer a \u003cstrong data-start=\"134\" data-end=\"147\"\u003e12AY7 RCA\u003c\/strong\u003e (6072 designation) in \u003cstrong data-start=\"182\" data-end=\"193\"\u003eNOS\u003c\/strong\u003e (\u003cem data-start=\"195\" data-end=\"222\"\u003eNew Old Stock\u003c\/em\u003e) condition, with the classic \u003cstrong data-start=\"250\" data-end=\"265\"\u003egray plates\u003c\/strong\u003e and \u003cstrong data-start=\"268\" data-end=\"280\"\u003ehalo getter\u003c\/strong\u003e construction. Manufactured in the \u003cstrong data-start=\"297\" data-end=\"312\"\u003eUnited States\u003c\/strong\u003e, this tube is \u003cstrong data-start=\"331\" data-end=\"342\"\u003etested\u003c\/strong\u003e and ready for use. It represents the most elegant RCA sound school, with low noise, excellent micro-detail, and a natural musicality that favors long, relaxed listening sessions.\u003c\/p\u003e\n\u003ch3 data-start=\"526\" data-end=\"552\"\u003eSonic Description\u003c\/h3\u003e\n\u003cp data-start=\"553\" data-end=\"1019\"\u003e\u003cstrong data-start=\"553\" data-end=\"563\"\u003eBass:\u003c\/strong\u003e dry and tight, well-controlled; clean and articulated fundamental without bloating.\u003cbr data-start=\"651\" data-end=\"654\"\u003e\u003cstrong data-start=\"654\" data-end=\"663\"\u003eMids:\u003c\/strong\u003e velvety and transparent; credible vocals and acoustic instruments with body and naturalness.\u003cbr data-start=\"749\" data-end=\"752\"\u003e\u003cstrong data-start=\"752\" data-end=\"761\"\u003eHighs:\u003c\/strong\u003e fine and graceful; airy extension without harshness, elegant RCA typical grain.\u003cbr data-start=\"838\" data-end=\"841\"\u003e\u003cstrong data-start=\"841\" data-end=\"854\"\u003eDynamics:\u003c\/strong\u003e fluid and proportionate; legible micro-contrast and controlled transients.\u003cbr data-start=\"930\" data-end=\"933\"\u003e\u003cstrong data-start=\"933\" data-end=\"948\"\u003eSoundstage:\u003c\/strong\u003e orderly and stable scene; good depth and precise central focus.\u003c\/p\u003e\n\u003ch3 data-start=\"1021\" data-end=\"1056\"\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1057\" data-end=\"1347\"\u003eThe \u003cstrong data-start=\"1060\" data-end=\"1073\"\u003e12AY7 RCA\u003c\/strong\u003e is recommended for \u003cspan class=\"s1\"\u003e\u003cb\u003einput or driver stages\u003c\/b\u003e\u003c\/span\u003e where perfect balance between sections is not required, and for hi-fi projects seeking \u003cstrong data-start=\"1180\" data-end=\"1229\"\u003etransparency, low noise, and tonal coherence\u003c\/strong\u003e. Excellent as a more \"refined\" alternative to the 12AX7 when lower gain and greater headroom are desired.\u003c\/p\u003e\n\u003ch3 data-start=\"1349\" data-end=\"1387\"\u003e🎸 Use in Musical Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1388\" data-end=\"1695\"\u003eHighly appreciated in \u003cstrong data-start=\"1408\" data-end=\"1414\"\u003eV1\u003c\/strong\u003e or the input stages of guitar and microphone amps, where it offers \u003cstrong data-start=\"1488\" data-end=\"1561\"\u003esuperior clean headroom, natural compression, and controlled attack\u003c\/strong\u003e. Perfect for blues, jazz, studio recording, and for those who desire clarity, soft dynamics, and less saturation compared to a 12AX7.\u003c\/p\u003e\n\u003ch3 data-start=\"1697\" data-end=\"1734\"\u003e🎯 Note for Audiophiles and Technicians\u003cstrong data-start=\"1737\" data-end=\"1747\"\u003e\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eOriginal \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS RCA\u003c\/b\u003e\u003c\/span\u003e tube, tested and verified, with \u003cspan class=\"s1\"\u003e\u003cb\u003ebalanced sections\u003c\/b\u003e\u003c\/span\u003e. Ideal for those seeking the \u003cspan class=\"s1\"\u003e\u003cb\u003eRCA sound character\u003c\/b\u003e\u003c\/span\u003e in critical positions. A balanced and reliable \u003cstrong data-start=\"2036\" data-end=\"2051\"\u003evintage RCA\u003c\/strong\u003e: the classic American sonic signature, with elegance, order, and naturalness.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVa = 250V, Vg = -4V\u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eGm = 1700 ; Ia = 3.0 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\u003cli\u003e\n\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 1500 ; Ia = 2.3 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 1510 ; Ia = 2.5 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics and Noise:\u003c\/strong\u003e Low. Tested and suitable for hi-fi use even in phono stages and guitar amplifiers. \u003cstrong\u003eAlso suitable for V1.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\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\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\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\n\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. \u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003eFully operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e\u003cspan\u003e Excellent – Markings excellently preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 73-09 → RMA\/EIA Open Date Code → manufactured in the 9th week of 1973\u003c\/li\u003e\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":42990263140599,"sku":"03555","price":89.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_040f8910-c58e-4d02-ba49-5af7efe402ce.jpg?v=1777381965"},{"product_id":"7199-sylvania-nos-nib-gray-plates-o-getter-matched-pair-tubes-made-in-usa","title":"7199 SYLVANIA NOS NIB Gray Plates O Getter Matched Pair Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e7199 SYLVANIA NOS\/NIB Gray Plates O Getter Matched Pair Tubes\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eMade by SYLVANIA in USA.\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eValves tested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e Voltage Test Triode: Va = 200V; Vg = -8V\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Triode Gm = 2100; Ia = 9 mA\u003cbr data-mce-fragment=\"1\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eVoltage Test Pentode: Va = 250V ; Vg2 = 125V ; Vg = -1.5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Pentode Gm = 7000\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1:\u003cbr data-mce-fragment=\"1\"\u003e Triode:\u003cspan\u003e \u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGm = 2900 ; Ia = 13 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e Valve 2:\u003cbr data-mce-fragment=\"1\"\u003e Triode:\u003cspan\u003e \u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGm = 2800 ; Ia = 13 m\u003cmeta charset=\"utf-8\"\u003e TO\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e Valve 1\u003cbr data-mce-fragment=\"1\"\u003e Pentode: Gm 7900\u003cbr data-mce-fragment=\"1\"\u003e Valve 2:\u003cbr data-mce-fragment=\"1\"\u003e Pentode: Gm 7500\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\"\u003eMicrophone 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 GAS Test\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":42990583513335,"sku":"00458","price":119.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/7199-sylvania-nos-nib-gray-plates-o-getter-matched-pair-tubes-made-in-usa-597274.jpg?v=1657112813"},{"product_id":"12at7-ecc81-mullard-labeled-ge-gray-plates-o-getter-tested-tube-made-in-gt-britain","title":"12AT7 \/ ECC81 GE by MULLARD Blackburn Wing Gray Plates Halo Getter Tested Tube MADE IN GT. BRITAIN","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong data-end=\"190\" data-start=\"131\"\u003e12AT7 \/ ECC81 GE by Mullard – Blackburn (Great Britain)\u003c\/strong\u003e\u003cbr data-end=\"193\" data-start=\"190\"\u003e \u003cstrong data-end=\"241\" data-start=\"193\"\u003eWing Gray Plates – Halo Getter – Tested Tube\u003c\/strong\u003e\u003cbr data-end=\"244\" data-start=\"241\"\u003e \u003cstrong data-end=\"301\" data-start=\"244\"\u003eLow Noise \u0026amp; Microphonics – Vintage British Production '60s\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n \u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003e12AT7 \/ ECC81 GE by MULLARD\u003c\/b\u003e\u003c\/span\u003e , produced in the historic \u003cspan class=\"s1\"\u003e\u003cb\u003eBlackburn factory (Great Britain)\u003c\/b\u003e\u003c\/span\u003e in \u003cspan class=\"s1\"\u003e\u003cb\u003e1963\u003c\/b\u003e\u003c\/span\u003e , is a highly prized signal tube, an authentic expression of the English Mullard school intended for the \u003cspan class=\"s1\"\u003e\u003cb\u003eGE\u003c\/b\u003e\u003c\/span\u003e market. The construction with \u003cspan class=\"s1\"\u003e\u003cb\u003ewing gray plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e identifies one of the most popular configurations of the British ECC81 of the early 1960s, known for its reliability, operational stability and refined sonic character.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The valve is \u003cspan class=\"s1\"\u003e\u003cb\u003etested\u003c\/b\u003e\u003c\/span\u003e and perfectly efficient, ready for use in quality hi-fi and music applications.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Compact, well-controlled, and uncluttered. The low end is precise and coherent, with a quick response that maintains balance and clarity.\u003c\/p\u003e\n\n \u003cp class=\"p3\"\u003e\u003cb\u003eMids:\u003c\/b\u003e Clear, present, and harmonically rich. Vocals sound natural and well-sculpted, with that signature Mullard musicality that lends realism and fluidity.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Open, silky, and well-extended. The high end is refined and never aggressive, making for detailed yet relaxing listening.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eDynamics:\u003c\/b\u003e Lively and controlled. Transient response is prompt, with legible microdynamics that make music reproduction energetic and precise.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Wide and well-focused. The soundstage is stable, with proper instrument separation and believable depth.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003c\/span\u003e Use in Hi-Fi Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Ideal for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e input and driver stages,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e preamplifiers and hi-fi amplifiers that require clarity, speed and control,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e systems oriented towards transparency and definition without sacrificing musicality.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003c\/span\u003e Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Also highly appreciated in:\u003c\/p\u003e\n\n\u003cul\u003e\n\n \u003cli class=\"p1\"\u003eguitar amplifiers and instruments,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e circuits where quick attack, definition and controlled dynamic response are required.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e It offers a bright but always balanced character, typically British.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003c\/span\u003e Note for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p3\"\u003e \u003cspan class=\"s2\"\u003eThis\u003c\/span\u003e \u003cb\u003e12AT7 \/ ECC81 GE by MULLARD Blackburn – Wing Gray Plates – Halo Getter (1963)\u003c\/b\u003e \u003cspan class=\"s2\"\u003erepresents:\u003c\/span\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cspan class=\"s1\"\u003eauthentic\u003c\/span\u003e \u003cb\u003eMullard production Made in Great Britain\u003c\/b\u003e \u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e GE branded supply for the international market,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e solid and historically correct construction,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e refined, fast and musical timbre.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e A valve designed for those who desire \u003cspan class=\"s1\"\u003e\u003cb\u003ethe precision and elegance of the Mullard ECC81\u003c\/b\u003e\u003c\/span\u003e , capable of enhancing hi-fi and musical systems with coherence, detail and personality in full \u003cspan class=\"s1\"\u003e\u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e\u003c\/span\u003e style.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n \u003cp\u003eValve tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -2V\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 5.5 ; Ia = 10.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Result:\u003c\/strong\u003e 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 Gm = 4.1 ; Ia = 8.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 4.5 ; Ia = 9.2 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low Noise \u0026amp; Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eBalance:\u003c\/strong\u003e The sections present a coherent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\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\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e TK3 B3A2 →\u003cmeta charset=\"utf-8\"\u003e TKx indicates an ECC81 with the sequential progression of x, where the increment of x indicates the production changes -\u003cmeta charset=\"utf-8\"\u003e B3A2 B → Mullard, Blackburn - 3 (out of four digits) → 1963 - A → January - 2 → 2nd week of the month\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":"MULLARD","offers":[{"title":"Default Title","offer_id":42997037170935,"sku":"00768S","price":44.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_ef38e5a4-ec19-4bc2-8259-788a1456ea9e.jpg?v=1770040654"},{"product_id":"201-a-01-a-silvertone-globe-radio-tubes-test-nos-specs-matched-tubes-made-in-usa-20s","title":"201-A ( 01-A ) SILVERTONE Globe Atwater Kent Radio Tubes Test @ NOS specs Matched Tubes Made in USA '20s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e201-A ( 01-A ) SILVERTONE Globe Atwater Kent Radio Tubes Test @ NOS Matched Tubes Made in USA '20s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e The bases are firm and there are no loose elements in the tubes or bases.\u003c\/p\u003e\n\u003cp\u003e Tested on AVO CT 160 Tube tester:\u003cbr data-mce-fragment=\"1\"\u003e Voltage Test: Va = 150V; Vg = -9V\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Gm = 800 ; Ia = 3 mA\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1: Gm = 900 ; Ia = 5 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 2: Gm = 900 ; Ia = 4 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 3: Gm = 1000 ; Ia = 6 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 4: Gm = 1050 ; Ia = 6 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 5: Gm = 1000 ; Ia = 5 mA\u003c\/p\u003e\n\u003cp\u003e Further tests performed:\u003cbr data-mce-fragment=\"1\"\u003e Microphonics Test\u003cbr data-mce-fragment=\"1\"\u003e Emission Quality\u003cbr data-mce-fragment=\"1\"\u003e Short Circuit Test\u003cbr\u003e\u003c\/p\u003e","brand":"SILVERTONE","offers":[{"title":"Default Title","offer_id":43061454733559,"sku":"00790T","price":279.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/201-a-01-a-silvertone-globe-radio-tubes-test-at-nos-specs-matched-tubes-made-in-usa-20s-369171.jpg?v=1658939682"},{"product_id":"copia-del-7199-sylvania-nos-nib-gray-plates-o-getter-matched-pair-tubes-made-in-usa","title":"7199 SYLVANIA Gray Plates O Getter Matched Pair Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e7199 SYLVANIA Gray Plates O Getter Matched Pair Tubes\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eMade by SYLVANIA in USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eValves tested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eVoltage Test Triode: Va = 200V; Vg = -8V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Triode Gm = 2100; Ia = 9 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eVoltage Test Pentode: Va = 250V ; Vg2 = 125V ; Vg = -1.5V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Pentode Gm = 7000\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong data-mce-fragment=\"1\"\u003eTest Result: STRONG\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eValve 1:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eTriode:\u003cmeta charset=\"utf-8\"\u003e Gm = 2300 ; Ia = 9 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eValve 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eTriode:\u003cmeta charset=\"utf-8\"\u003e Gm = 1700 ; Ia = 7 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eValve 1\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003ePentode: Gm 5600\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eValve 2:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003ePentode: Gm 5400\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\"\u003eMicrophone 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 GAS Test\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":43115199168759,"sku":"00809","price":89.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/7199-sylvania-gray-plates-o-getter-matched-pair-tubes-made-in-usa-995518.jpg?v=1660166921"},{"product_id":"7643-e80cf-amperex-mullard-mitcham-plant-matched-pair-tubes-made-in-gt-britain","title":"7643 ( E80CF ) MULLARD Mitcham plant Gold Pin Matched Pair Tubes MADE in GT. BRITAIN","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e7643 ( E80CF ) MULLARD Mitcham plant Gold Pin Matched Pair Tubes MADE in GT. BRITAIN\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Same Manufacturing Code:\u003cbr\u003e BG2 R4J2\u003c\/p\u003e\n\u003cp\u003e MADE BY MULLARD UK, labelled AMPEREX\u003c\/p\u003e\n\u003cp\u003e Valves tested on AVO VCM 163 Tube tester:\u003cbr data-mce-fragment=\"1\"\u003e Voltage Test:\u003cbr\u003e Triode Va = 100V, Vg = -2V\u003cbr\u003e Pentode\u003cmeta charset=\"utf-8\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eVa = 200V,\u003cmeta charset=\"utf-8\"\u003e Vg2 = 175V, Vg = -2V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Triode Gm = 5000; Ia = 14 mA\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Pentode\u003cmeta charset=\"utf-8\"\u003e Gm = 6200 ; Ia = 10 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1\u003cbr data-mce-fragment=\"1\"\u003e Section 1: Gm 5100 ; Ia 13.5 mA\u003cbr data-mce-fragment=\"1\"\u003e Section 2: Gm 6000 ; Ia 12.0 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 2:\u003cbr data-mce-fragment=\"1\"\u003e Section 1: Gm 5100 ; Ia 14.0 mA\u003cbr data-mce-fragment=\"1\"\u003e Section 2: Gm 6000 ; Ia 13.0 mA\u003c\/p\u003e\n\u003cp\u003e Further tests performed:\u003cbr data-mce-fragment=\"1\"\u003e Microphonics Test\u003cbr data-mce-fragment=\"1\"\u003e Emission Quality\u003cbr data-mce-fragment=\"1\"\u003e Short Circuit Test\u003cbr\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":43150717583607,"sku":"00822T","price":59.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/7643-e80cf-amperex-mullard-mitcham-plant-gold-pin-matched-pair-tubes-made-in-gt-britain-224716.jpg?v=1660945616"},{"product_id":"301-a-01-a-cunningham-globe-atwater-kent-radio-tubes-test-nos-specs-matched-tubes-made-in-usa-20s","title":"CX-301-A ( 01-A ) CUNNINGHAM Globe Atwater Kent Radio Tubes Test @ NOS specs Tubes Made in USA '20s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eCX-301-A ( 01-A ) CUNNINGHAM Globe Atwater Kent Radio Tubes Test @ NOS specs Tubes Made in USA '20s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e The bases are narrow and there are no loose elements in the tubes or bases.\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTested on AVO CT 160 Tube tester:\u003c\/strong\u003e\u003cbr\u003e Our instruments are calibrated with reference tubes.\u003cbr\u003e Voltage Test: Va = 150V; Vg = -9V\u003cbr\u003e Average 100% Gm = 800 ; Ia = 3 mA\u003cbr\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan style=\"color: rgb(43, 0, 255);\"\u003eValve 1: Gm = 1000 ; Ia = 5.0 mA\u003cmeta charset=\"utf-8\"\u003e - SOLD\u003c\/span\u003e\u003cbr\u003e \u003cspan style=\"color: rgb(43, 0, 255);\"\u003eValve 2: Gm = 1000 ; Ia = 6.0 mA - SOLD\u003c\/span\u003e\u003cbr\u003e Valve 3: Gm = 1000 ; Ia =\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e6.0\u003c\/span\u003e mA\u003cbr\u003e \u003cspan style=\"color: rgb(43, 0, 255);\"\u003eValve 4: Gm = 1100 ; Ia =\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e6.0\u003c\/span\u003e mA\u003cmeta charset=\"utf-8\"\u003e - SOLD\u003c\/span\u003e\u003cbr\u003e \u003cspan style=\"color: rgb(43, 0, 255);\"\u003eValve 5: Gm = 1000 ; Ia = 5.5 mA\u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan style=\"color: rgb(43, 0, 255);\"\u003e- SOLD\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e Further tests performed:\u003cbr\u003e Microphonics Test\u003cbr\u003e Emission Quality\u003cbr\u003e Short Circuit Test\u003c\/p\u003e","brand":"CUNNINGHAM","offers":[{"title":"Default Title","offer_id":43163435401463,"sku":"00828T","price":55.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_e39ab3da-336c-4d7a-a1b8-34970e607f5b.jpg?v=1733064435"},{"product_id":"ux-201-a-01-a-rca-globe-atwater-kent-radio-tubes-test-nos-specs-matched-tubes-made-in-usa-20s","title":"UX-201-A ( 01-A ) RCA Globe Atwater Kent Radio Tubes Test @ NOS specs Matched Tubes Made in USA '20s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eUX-201-A ( 01-A ) RCA Globe Atwater Kent Radio Tubes Test @ NOS Matched Tubes Made in USA '20s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e The bases are firm and there are no loose elements in the tubes or bases.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eNote: One of the two valves has a visible crack on the plastic base (see photo), which does not affect its operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e Tested on AVO CT 160 Tube tester:\u003cbr\u003e Voltage Test: Va = 150V; Vg = -9V\u003cbr\u003e Average 100% Gm = 800 ; Ia = 3 mA\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1: Gm = 1000 ; Ia = 5.0 mA\u003cbr\u003e Valve 2: Gm = 1100 ; Ia = 7.0 mA\u003cbr\u003e Valve 3: Gm = 1000 ; Ia = 5 \u003cspan\u003e,0\u003c\/span\u003e mA\u003cbr\u003e Valve 4: Gm = 1000 ; Ia = 5 \u003cspan\u003e,0\u003c\/span\u003e mA\u003cbr\u003e Valve 5: Gm = 1100 ; Ia = 6.0 mA\u003c\/p\u003e\n\u003cp\u003e Further tests performed:\u003cbr\u003e Microphonics Test\u003cbr\u003e Emission Quality\u003cbr\u003e Short Circuit Test\u003cbr\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43163602845943,"sku":"00829T","price":279.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/ux-201-a-01-a-rca-globe-atwater-kent-radio-tubes-test-at-nos-specs-matched-tubes-made-in-usa-20s-281774.jpg?v=1661267984"},{"product_id":"ux-201-a-01-a-rca-globe-atwater-kent-radio-tubes-test-nos-specs-matched-tubes-made-in-usa-20s-1","title":"UX-201-A ( 01-A ) RCA Globe Atwater Kent Radio Tubes Test @ NOS specs Matched Tubes Made in USA '20s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eUX-201-A ( 01-A ) RCA Globe Atwater Kent Radio Tubes Test @ NOS Matched Tubes Made in USA '20s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e The bases are firm and there are no loose elements in the tubes or bases.\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/p\u003e\n\u003cp\u003e Tested on AVO VCM 163 Tube tester:\u003cbr data-mce-fragment=\"1\"\u003e Voltage Test: Va = 150V; Vg = -9V\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Gm = 800 ; Ia = 3 mA\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1: Gm = 900 ; Ia = 5.5 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 2: Gm = 800 ; Ia = 4.0 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 3: Gm = 800 ; Ia = 4.0 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 4: Gm = 800 ; Ia = 5.7 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 5: Gm = 800 ; Ia = 5.0 mA\u003c\/p\u003e\n\u003cp\u003e Further tests performed:\u003cbr data-mce-fragment=\"1\"\u003e Microphonics Test\u003cbr data-mce-fragment=\"1\"\u003e Emission Quality\u003cbr data-mce-fragment=\"1\"\u003e Short Circuit Test\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43183801696503,"sku":"00839T","price":279.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/ux-201-a-01-a-rca-globe-atwater-kent-radio-tubes-test-at-nos-specs-matched-tubes-made-in-usa-20s-527475.jpg?v=1661778090"},{"product_id":"12av7-rca-black-plates-o-getter-matched-tubes-made-in-usa","title":"12AV7 RCA Black Plates O Getter Matched Pair Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AV7 RCA Black Plates O Getter Matched Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003cbr\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eProduced by RCA - USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTested on \u003cstrong\u003eAVO VCM 163\u003c\/strong\u003e Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 150V, Vg = -1V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Gm = 8.5 ; Ia = 18 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\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003cbr\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1: Gm 7.0 ; Ia = 22 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2: Gm 6,8 ; Ia = 19 mA\u003c\/span\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1: Gm 7,7 ; Ia = 19 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 2: Gm 8,3 ; Ia = 22 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\"\u003eMicrophonics 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\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":43442370642167,"sku":"00949T","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/12av7-rca-black-plates-o-getter-matched-tubes-made-in-usa-193264.jpg?v=1665667270"},{"product_id":"12at7wa-6101-ge-nos-wing-gray-plates-o-getter-tested-tube-made-in-usa","title":"12AT7 WA ( 6201 ) GE NOS Wing Gray Plates O Getter Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AT7WA ( 6201 ) GE NOS Wing Gray Plates O Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eThese tubes offer a sound characterized by remarkable clarity and detail, with a well-balanced midrange and an airy, bright high-frequency extension. This gray-plated version has a slightly warm tone without losing definition, making it perfect for those seeking a balance between precision and musicality. Ideal for Hi-Fi audio and musical instruments, they ensure rich, detailed sound reproduction.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eManufactured by GENERAL ELECTRIC in USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eMilitary Destination\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eWorn logos as shown in the photo\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eTested on AVO VCM 163 Tube tester:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 250V; Vg = -2V ; Vf = 6.3V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Gm = 5.5 ; Ia = 10 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\"\u003eSection 1: Gm = 5.7 ; Ia = 11 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cspan data-mce-fragment=\"1\"\u003eSection 2: Gm = 5.6 ; Ia = 10 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\"\u003eMicrophone 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\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":43766463070455,"sku":"01194T","price":29.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_9b1daa4c-e75f-4e8d-8dd7-a046565b3417.jpg?v=1677494197"},{"product_id":"12at7-ecc81-raytheon-black-wing-tilt-getter-matched-tubes-made-in-usa-50s","title":"12AT7 ( ECC81 ) RAYTHEON Black Wing [] Tilt Getter Tested Tube Made In USA '50s","description":"\u003cp\u003e\u003cstrong\u003e12AT7 ( ECC81 ) RAYTHEON Black Wing [] Tilt Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade In USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eProduced by RAYTHEON in USA.\u003cbr data-mce-fragment=\"1\"\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003eThe offer is for a selected valve\u0026nbsp;“Tested”\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp\u003eTested on AVO VCM 163 Tube tester:\u003cbr data-mce-fragment=\"1\"\u003eVoltage Test: Va = 250V; Vg = -2V ; Vf = 6.3V\u003cbr data-mce-fragment=\"1\"\u003eAverage 100% Gm =\u0026nbsp;5.5 ; Ia = 10 mA\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTEST RESULT:\u0026nbsp; VERY STRONG\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eSection 1: \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGm =\u0026nbsp;4.0 ; Ia =\u0026nbsp;10 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGm =\u0026nbsp;4.2 ; Ia = 10 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003eFurther tests performed:\u003cbr data-mce-fragment=\"1\"\u003eMicrophony Test\u003cbr data-mce-fragment=\"1\"\u003eEmission Quality\u003cbr data-mce-fragment=\"1\"\u003eShort Circuit Test\u003cbr\u003e\u003c\/p\u003e","brand":"RAYTHEON","offers":[{"title":"Default Title","offer_id":43766628679927,"sku":"01196U","price":29.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_b145fdd3-9fe8-41f3-bd78-9dafff92ff5e.jpg?v=1677507309"},{"product_id":"12by7a-el180-ge-nos-black-plates-halo-getter-tubes-tektronix-checked","title":"12BY7A ( EL180 ) GE NOS Black Plates Halo Getter Matched Tubes by TEKTRONIX","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12BY7A ( EL180 ) GE NOS Black Plates Halo Getter Matched Tubes by TEKTRONIX\u0026nbsp;\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003e\u003cspan data-mce-fragment=\"1\"\u003eMade in USA\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMatched by\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eTEKTRONIX INC. USA - Matching serial numbers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSame manufacturing batch\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTested\u0026nbsp;on AMPLITREX AT-1000 Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 250V, Vg2 = 180V; Vg = -3.2V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Gm =\u0026nbsp;11 ; Ia =\u0026nbsp;26 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eGm = 13.3\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u0026nbsp;; Ia = 30\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u0026nbsp;mA\u003c\/span\u003e\u003cbr\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cmeta charset=\"utf-8\"\u003eValve 2:\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003eGm = 14.2\u0026nbsp;; Ia = 31\u0026nbsp;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\u003cbr\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":46487481581916,"sku":"01324","price":59.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/products\/1_f748304b-ccae-401e-a71d-f0986d3815f2.jpg?v=1681461850"},{"product_id":"12by7a-el180-rca-nos-nib-gray-plates-o-solid-getter-tubes","title":"5847A JAN ( 404A ) AMPEREX NOS NIB Black Plates Halo Getter Gold Pin Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5847A JAN ( 404A ) AMPEREX NOS NIB Black Plates Halo Getter Gold Pin Tubes\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eThe offer is for\u0026nbsp;5 selected valves tested (\u0026nbsp;5\u0026nbsp;pcs ).\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eTested on AVO VCM 163 Tube tester:\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eVoltage Test: Va = 150V, Vg2 = 150V; Vg = -2V\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eAverage 100% Gm =\u0026nbsp;12.5 ; Ia = 13 mA\u003c\/span\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTest results see photo\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\u003cbr\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":46663270760796,"sku":"01385","price":59.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_8946cbab-b097-4b5c-b352-60ee7c51e49e.jpg?v=1683300596"},{"product_id":"6sn7gta-ge-labeled-raytheon-gray-plates-tested-tube-made-in-usa-52","title":"6SN7 GTA RAYTHEON Gray Plates Horse Shoe Getter Tested Tube Made in USA '54","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003e6SN7GTA RAYTHEON Gray Plates Horse Shoe Getter Tested Tube\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eMADE IN USA '54\u003c\/strong\u003e\u003c\/span\u003e\u0026nbsp;\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eManufactured by General Electric U.S.A. labeled for RAYTHEON U.S.A.\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003eVoltage Test: Va = 250V, Vg = -8V, Vf = 6.3V\u003cbr data-mce-fragment=\"1\"\u003eAverage 100% Gm = 2600 ; Ia = 9.0 mA\u003cbr data-mce-fragment=\"1\"\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eSection 1:\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eGm = 2350 ; Ia = 7.8 mA\u003cbr data-mce-fragment=\"1\"\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003eGm = 2250 ; Ia = 6.0 mA\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cbr data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-mce-fragment=\"1\"\u003eFurther tests performed:\u003cbr\u003eMicrophony and background noise tests\u003cbr\u003eEmission quality\u003cbr\u003eShort circuit tests\u003cbr\u003eGAS tests\u003c\/span\u003e\u003c\/p\u003e","brand":"RAYTHEON","offers":[{"title":"Default Title","offer_id":46669635453276,"sku":"01390","price":22.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_a448ebfa-ab22-4768-ad52-55ad40889fbf.jpg?v=1720796014"},{"product_id":"5963-ecc82-12au7-sylvania-halo-getter-long-plates-tested-balanced-tube-made-in-usa-50s","title":"5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"770\" data-start=\"364\"\u003eThis \u003cstrong data-end=\"404\" data-start=\"371\"\u003e5963 (12AU7 \/ ECC82) SYLVANIA\u003c\/strong\u003e , produced in the USA in the 1950s, represents one of the most refined and technically sound interpretations of the vintage American 12AU7.\u003cbr data-end=\"556\" data-start=\"553\"\u003eThe construction with \u003cstrong data-end=\"590\" data-start=\"575\"\u003elong plates\u003c\/strong\u003e and \u003cstrong data-end=\"608\" data-start=\"593\"\u003ehalo getters\u003c\/strong\u003e is typical of high-quality Sylvania productions, appreciated for the balance between operational reliability, sonic transparency and linear behavior over time.\u003c\/p\u003e\n\u003cp data-end=\"982\" data-start=\"772\"\u003e\u003cstrong data-end=\"805\" data-start=\"780\"\u003eTested and selected\u003c\/strong\u003e valve, with stable emission and low background noise, designed for hi-fi and professional audio applications where coherence, control and musicality without excesses are required.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1196\" data-start=\"1058\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBass:\u003c\/strong\u003e Precise and well-controlled. The low range is dry, uncluttered, and free of artificial emphasis, favoring clarity and rhythmic articulation.\u003c\/li\u003e\n\u003cli data-end=\"1408\" data-start=\"1213\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eMids:\u003c\/strong\u003e Open and natural. Voices and acoustic instruments are well-proportioned, with a clean, clear reproduction, typically Sylvania: less \"warm\" than RCA, but more neutral and transparent.\u003c\/li\u003e\n\u003cli data-end=\"1551\" data-start=\"1425\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eHighs:\u003c\/strong\u003e Clear and well-extended. The high end is airy and defined, without harshness, with elegant detail that doesn't tire the listener.\u003c\/li\u003e\n\u003cli data-end=\"1699\" data-start=\"1572\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eDynamics:\u003c\/strong\u003e Balanced and smooth. The response is prompt but composed, ideal for line stages, drivers, and signal control sections.\u003c\/li\u003e\n\u003cli data-end=\"1858\" data-start=\"1722\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eSoundstage:\u003c\/strong\u003e A tidy and well-focused scene. Correct separation of sound planes and a stable image, with a realistic and coherent presentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1884\" data-end=\"1924\"\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"1917\" data-start=\"1906\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1955\" data-start=\"1920\"\u003epreamplifiers and line stages\u003c\/li\u003e\n\u003cli data-end=\"1994\" data-start=\"1958\"\u003ebuffers and coupling circuits\u003c\/li\u003e\n\u003cli data-end=\"2065\" data-start=\"1997\"\u003eVintage and modern hi-fi amplifiers compatible with 12AU7 \/ 5963\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2232\" data-start=\"2067\"\u003eParticularly suitable for \u003cstrong data-end=\"2144\" data-start=\"2096\"\u003enon-critical or moderate gain positions\u003c\/strong\u003e , where operational stability, low overall noise and timbral coherence are required.\u003c\/p\u003e\n\u003ch3 data-start=\"2243\" data-end=\"2293\"\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"2287\" data-start=\"2276\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2345\" data-start=\"2290\"\u003e\u003cstrong data-end=\"2313\" data-start=\"2303\"\u003edriver\u003c\/strong\u003e positions, \u003cstrong data-end=\"2333\" data-start=\"2315\"\u003ephase inverter\u003c\/strong\u003e or V2 \/ V3\u003c\/li\u003e\n\u003cli data-end=\"2384\" data-start=\"2348\"\u003eguitar and bass amplifiers\u003c\/li\u003e\n\u003cli data-end=\"2436\" data-start=\"2387\"\u003eapplications in studio and professional contexts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2672\" data-start=\"2438\"\u003eIt offers reliable, controlled operation, with low noise and predictable response.\u003cbr data-end=\"2534\" data-start=\"2531\"\u003eIt is recommended to avoid using it in \u003cstrong data-end=\"2603\" data-start=\"2568\"\u003eV1 or in very high gain stages\u003c\/strong\u003e , where specifically selected low-noise tubes are preferable.\u003c\/p\u003e\n\u003ch3 data-start=\"2566\" data-end=\"2601\"\u003e🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eA well-built and well-tested \u003cstrong data-end=\"2745\" data-start=\"2719\"\u003e1950s Sylvania 5963\u003c\/strong\u003e , designed for those looking for \u003cstrong data-end=\"2839\" data-start=\"2799\"\u003eneutrality, control and reliability\u003c\/strong\u003e , with the classic American approach that is more linear and transparent than its “warmer” counterparts.\u003cbr data-end=\"2944\" data-start=\"2941\"\u003eA rational and musical choice for hi-fi systems and professional applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve 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 \u003cspan\u003eVa = 250V ; Vg = -8.5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2200 ; Ia = 10.5 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\u0026nbsp;\u003c\/span\u003eGm = 2200 ; Ia = 9.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 8.4 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 Microphonics and Noise: Very Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.\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 - Comes 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 Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable – Made by SYLVANIA USA, identifiable by construction features. 1950s\u003c\/li\u003e\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":46757909594460,"sku":"01465","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_adf9bc4b-da4b-4d8a-8e13-b5f37d7acf5e.jpg?v=1767635953"},{"product_id":"12au7-ecc82-raytheon-long-black-plates-square-getter-tested-tube-made-in-usa-58","title":"12AU7 ECC82 RAYTHEON Long Black Plates Square Getter Tested Tube Made in USA '58","description":"\u003cp\u003e \u003cstrong\u003e12AU7 ( ECC82 ) RAYTHEON Long Black Plates Square Getter Tested Tube Made in USA '58\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\u003e12AU7\/ECC82 RAYTHEON\u003c\/b\u003e\u003c\/span\u003e with \u003cspan class=\"s1\"\u003e\u003cb\u003elong black plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003esquare getter\u003c\/b\u003e\u003c\/span\u003e , produced in the United States in \u003cspan class=\"s1\"\u003e\u003cb\u003e1958\u003c\/b\u003e\u003c\/span\u003e , is one of the most refined and sought-after versions of this medium-gain double triode. The \u003cspan class=\"s1\"\u003e\u003cb\u003elong black plate\u003c\/b\u003e\u003c\/span\u003e construction is typical of the best American production of the late 1950s and gives this tube a solid, deep and particularly musical sonic personality.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThe unit has been carefully tested in our laboratory and passed the tests with a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, demonstrating excellent electrical performance. The tube is also \u003cspan class=\"s1\"\u003e\u003cb\u003ebalanced\u003c\/b\u003e\u003c\/span\u003e , with \u003cspan class=\"s1\"\u003e\u003cb\u003every low noise and microphonics\u003c\/b\u003e\u003c\/span\u003e , making it suitable even for sensitive circuit positions.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p4\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Full-bodied, full, and well-articulated. The bass is authoritative yet controlled, with a sense of depth that gives solidity to the entire range.\u003c\/p\u003e\n\n\u003cp class=\"p4\"\u003e \u003cb\u003eMids:\u003c\/b\u003e This Raytheon's strong point. The mids are dense, natural, and nuanced, with vocals rendered with exceptional credibility and substance.\u003c\/p\u003e\n\n\u003cp class=\"p4\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Smooth and well-integrated, never aggressive. The high end is present but well-mannered, allowing for extended listening without fatigue.\u003c\/p\u003e\n\n \u003cp class=\"p4\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e Smooth and composed. Transient response is natural, with a smooth progression that prioritizes musicality over artificial impact.\u003c\/p\u003e\n\n\u003cp class=\"p4\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Stable and well-proportioned soundstage, with excellent instrument separation and precise focus.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Ideal as a line valve, driver, or preamp stage in high-quality hi-fi amplifiers and preamps. Its low noise and good balance also make it suitable for high-resolution systems.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003e🎸 Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e Also appreciated in the musical field for its warm and controlled character, perfect where a balanced response and a rich harmonic output are desired.\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e produced in the USA in 1958,\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cb\u003eVERY STRONG\u003c\/b\u003e \u003cspan class=\"s1\"\u003eheader\u003c\/span\u003e \u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cb\u003ebalanced\u003c\/b\u003e \u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \n\u003cspan class=\"s1\"\u003ewith\u003c\/span\u003e \u003cb\u003elow noise \u0026amp; low microphonics\u003c\/b\u003e \u003cspan class=\"s1\"\u003e,\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e selected for higher-level applications.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e A tube that best expresses the classic American Raytheon character, designed for those seeking \u003cspan class=\"s1\"\u003e\u003cb\u003emusicality, reliability and an authoritative timbre\u003c\/b\u003e\u003c\/span\u003e , in full \u003cspan class=\"s1\"\u003e\u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e\u003c\/span\u003e style.\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 \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8.5V\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 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\u003eGm = 1900 ; Ia = 9.6 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1900 ; Ia = 9.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e \u003cspan\u003eLow. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are coherent and well aligned, making the valve also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFully operational.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOutput Quality:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExcellent – ​​Very strong and stable output, no fluctuations.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAbsent.\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 \u003cspan\u003eVintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003c\/span\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Excellent – ​​Excellently preserved lettering, minimal signs of wear. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 280 58-17 → 280 indicates the manufacturer, i.e., Raytheon Mfg. Company, Newton 58, Mass. - 58-17 → RMA\/EIA Open Date Code → manufactured week 17, 1958\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":"RAYTHEON","offers":[{"title":"Default Title","offer_id":46862086504796,"sku":"01536","price":49.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_545aa3f3-0b61-4e7f-a098-75c937a54a5d.jpg?v=1769605616"},{"product_id":"12ax7-ecc83-sylvania-long-plates-square-getter-tested-tube-made-in-usa-nel-1949","title":"12AX7 ( ECC83 ) SYLVANIA Long Gray plates Square Getter Tested Tube Made in USA in 1949","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AX7 \/ ECC83 SYLVANIA Long Gray plates Square Getter Tested 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\u003eThe Baldwin-branded 12AX7 SYLVANIA stands out for its exceptional sound quality. Featuring a rich, warm, and detailed sound, this tube offers an extended frequency response and superb dynamics. \u003cstrong\u003eAudiophiles appreciate its ability to faithfully reproduce both the most delicate and most powerful tones\u003c\/strong\u003e, giving music extraordinary presence and depth.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eBaldwin-branded 12AX7 SYLVANIA\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eis also commonly used in \u003c\/span\u003e\u003cstrong\u003etube guitar amplifiers\u003c\/strong\u003e\u003cspan\u003e across a wide range of musical genres, including rock, blues, jazz, country, and many others. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThis rare square getter version manages to surpass the excellent performance of the halo getter version in terms of refinement. \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube with balanced sections\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProduced by SYLVANIA, labeled Baldwin. \u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLogos worn as shown in photos\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 250V, Vg = -2V, Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Gm = 1600 ; Ia = 1.2 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eSection 1: \u003cmeta charset=\"utf-8\"\u003eGm = 1500 ; Ia = 1.0 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003eGm = 1500 ; Ia = 1.0 mA\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eAdditional tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMicrophonics Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eGAS Test\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":46862685077852,"sku":"01538V","price":56.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/5_66a244f9-b033-4849-aee0-c557a182b4b2.jpg?v=1780565479"},{"product_id":"12au7-ecc82-sylvania-gray-plates-square-getter-matched-tubes-made-in-usa-47","title":"12AU7 ( ECC82 ) SYLVANIA NOS Short Gray Plates Square Getter Tested Tube Made in USA '47","description":"\u003cp\u003e\u003cstrong\u003e12AU7 ( ECC82 ) SYLVANIA NOS Short Gray Plates Square Getter Tested Tube Made in USA '47\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eNote: Price refers to one selected valve\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"569\" data-start=\"32\"\u003e\u003cmeta charset=\"utf-8\"\u003e This \u003cstrong data-start=\"37\" data-end=\"67\"\u003e12AU7 \/ ECC82 SYLVANIA NOS\u003c\/strong\u003e , \u003cstrong data-start=\"69\" data-end=\"89\"\u003eMade in USA 1947\u003c\/strong\u003e , belongs to the \u003cstrong data-start=\"107\" data-end=\"141\"\u003every first historical productions\u003c\/strong\u003e of this tube, built in the immediate post-war period to extremely high construction standards. The configuration with \u003cstrong data-start=\"271\" data-end=\"292\"\u003eshort gray plates\u003c\/strong\u003e and \u003cstrong data-start=\"295\" data-end=\"312\"\u003esquare getter\u003c\/strong\u003e identifies a very early variant, rare today, appreciated for its mechanical solidity, operational stability and very refined sonic character. \u003cbr data-start=\"455\" data-end=\"458\"\u003eThe valve is \u003cstrong data-start=\"471\" data-end=\"482\"\u003etested\u003c\/strong\u003e and perfectly efficient, transmitting from the first notes the sensation of an authentic, selected component of great historical value.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"658\" data-end=\"814\"\u003e\u003cstrong data-start=\"658\" data-end=\"667\"\u003eBass:\u003c\/strong\u003e Clean, well-controlled, and natural. The low end is composed and coherent, with a tidy response that supports the music without being heavy.\u003c\/p\u003e\n\u003cp data-start=\"816\" data-end=\"995\"\u003e\u003cstrong data-start=\"816\" data-end=\"824\"\u003eMids:\u003c\/strong\u003e The hallmark of this production. Rich, fluid, and very realistic, with present vocals and an elegant harmonic texture, typical of early Sylvania from the 1940s.\u003c\/p\u003e\n\u003cp data-start=\"997\" data-end=\"1143\"\u003e\u003cstrong data-start=\"997\" data-end=\"1005\"\u003eHighs:\u003c\/strong\u003e Sweet, silky, and perfectly integrated. The highs are refined and never aggressive, encouraging relaxed, long-lasting listening.\u003c\/p\u003e\n\u003cp data-start=\"1145\" data-end=\"1302\"\u003e\u003cstrong data-start=\"1145\" data-end=\"1157\"\u003eDynamics:\u003c\/strong\u003e Balanced and fluid. The response is prompt but always controlled, with a natural microdynamic that restores vitality without forcing.\u003c\/p\u003e\n\u003cp data-start=\"1304\" data-end=\"1459\"\u003e\u003cstrong data-start=\"1304\" data-end=\"1318\"\u003eSoundstage:\u003c\/strong\u003e Stable, airy, and well-proportioned. The soundstage is believable, with natural instrument placement and consistent depth.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1513\" data-end=\"1565\"\u003ehigh-end preamplifiers and line stages,\u003c\/li\u003e\n\u003cli data-start=\"1568\" data-end=\"1620\"\u003edrivers in single-ended and push-pull amplifications,\u003c\/li\u003e\n\u003cli data-start=\"1623\" data-end=\"1700\"\u003ehi-fi systems that prioritize naturalness, musicality and timbral coherence.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1702\" data-end=\"1772\"\u003eParticularly suitable for jazz, vocal, classical and acoustic music.\u003c\/p\u003e\n\u003ch3 data-start=\"1774\" data-end=\"1825\"\u003e\u003cstrong\u003e🎸 Use in Music Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1774\" data-end=\"1825\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1828\" data-end=\"1896\"\u003einstrument amplifiers in driver stages or vintage circuits,\u003c\/li\u003e\n\u003cli data-start=\"1899\" data-end=\"1975\"\u003eboutique projects that seek an authentic and refined sound character.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1977\" data-end=\"2033\"\u003eIt offers a full, controlled and harmonically rich sound.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2035\" data-end=\"2168\"\u003eThis \u003cstrong data-start=\"2080\" data-end=\"2153\"\u003e12AU7 \/ ECC82 SYLVANIA NOS – Short Gray Plates – Square Getter (1947)\u003c\/strong\u003e represents:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2171\" data-end=\"2235\"\u003ean \u003cstrong data-start=\"2175\" data-end=\"2232\"\u003eextremely early and now rare American production\u003c\/strong\u003e ,\u003c\/li\u003e\n\u003cli data-start=\"2238\" data-end=\"2290\"\u003eSylvania post-war build quality,\u003c\/li\u003e\n\u003cli data-start=\"2293\" data-end=\"2340\"\u003estable and reliable electrical behavior,\u003c\/li\u003e\n\u003cli data-start=\"2343\" data-end=\"2397\"\u003eelegant, natural and historically correct timbre.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2399\" data-end=\"2606\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eA valve designed for those who want \u003cstrong data-start=\"2436\" data-end=\"2462\"\u003enot just a NOS 12AU7\u003c\/strong\u003e , but \u003cstrong data-start=\"2467\" data-end=\"2515\"\u003ean authentic original sound experience\u003c\/strong\u003e , capable of enhancing high-end hi-fi systems with timeless class and personality.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve 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 \u003cspan\u003eVa = 250V ; Vg = -8.5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2200 ; Ia = 10.5 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\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 10.0 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2050 ; Ia = 9.5 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\u0026nbsp;\u003c\/span\u003eGm = 2050 ; Ia = 9.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 10.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 3: \u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eSOLD\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 9.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 9.5 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 4:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2000 ; Ia = 9.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2050 ; Ia = 9.5 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 5:\u003cmeta charset=\"utf-8\"\u003e\u0026nbsp; \u0026nbsp; \u0026nbsp;SOLD\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 10.0 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2150 ; Ia = 10.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 6:\u0026nbsp; \u0026nbsp; \u0026nbsp;SOLD\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2150 ; Ia = 10.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 10.0 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 Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\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 502 752 → 502 (administrative origin) manufactured by Sylvania for American Radio Hardware Co., Inc., Mt. Vernon, NY - 752 → 2 (of three digits) → 1947 - 52 → 52nd week of the year\u003c\/li\u003e\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":46899306496348,"sku":"01551T","price":24.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/8_dab47132-4583-48a6-a7ec-dc77ffb35acc.jpg?v=1769450112"},{"product_id":"12ax7-ecc83-tungsram-short-gray-plate-dual-post-o-getter-matched-tubes-made-in-hungary","title":"12AX7 A ( ECC83 ) TUNGSRAM Short Gray Plate Dual Post O Getter Matched Tubes Made in Hungary","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AX7A ( ECC83 ) TUNGSRAM Short Gray Plate Dual Post\u0026nbsp;O\u0026nbsp;Getter Matched Tubes \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMade in Hungary\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe\u0026nbsp;12AX7 \u003cmeta charset=\"utf-8\"\u003eTUNGSRAM\u003cstrong\u003e\u0026nbsp;\u003c\/strong\u003eis a very musical\u0026nbsp;and harmonic-rich tube\u0026nbsp;with a\u0026nbsp;wide and deep soundstage. The airiness is superb, rich in detail and with excellent separation of instruments.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLogos worn as per photo\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eLabeled by NATIONAL ELECTRONICS\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe offer is for a selected \"Matched Pair\".\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTested on\u0026nbsp;AMPLITREX AT-1000 Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 250V ; Vg = -2V ; Vf = 6.3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Gm = 1600 ; Ia = 1.2 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eValve 1:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1: Gm\u0026nbsp;1800 ; Ia\u0026nbsp;1.5 Ma\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: Gm\u0026nbsp;1700 ; Ia\u0026nbsp;1.1 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 2:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1: Gm\u0026nbsp;2100 ; Ia\u0026nbsp;1.5 Ma\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: Gm\u0026nbsp;1800 ; Ia\u0026nbsp;1.1 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":"TUNGSRAM","offers":[{"title":"Default Title","offer_id":46986382311772,"sku":"01582","price":139.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/11_2d0c675c-38f7-4dd1-96b1-ea48fc46415f.jpg?v=1692178975"},{"product_id":"copia-del-12ax7-ecc83-nos-sylvania-halo-getter-tested-tube-made-in-usa-nel-1949","title":"12AX7 \/ ECC83 NOS SYLVANIA Halo Getter Curve Tracer Tested \u0026 Balanced Tube Made in USA in 1964","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Made in USA 1964\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – Low Noise \u0026amp; Microphonics – Vintage American Sylvania Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eGeneral Description\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, manufactured in the United States in 1964, represents one of the most highly regarded American interpretations of the famous ECC83.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eTubes branded \u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e were intended for high-end electronic organs of the era and were selected by manufacturers who demanded reliability, low noise, and long operating life. Behind the Baldwin brand, in this case, we find the renowned \u003cspan class=\"s1\"\u003e\u003cb\u003eSYLVANIA Made in USA\u003c\/b\u003e\u003c\/span\u003e production, recognizable by its \u003cspan class=\"s1\"\u003e\u003cb\u003eGray Plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e construction, a configuration particularly appreciated by enthusiasts for its tonal balance and natural musicality.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eSylvania Gray Plates from the early 1960s are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThis tube has been carefully verified using \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e, resulting in a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e performance, exceeding nominal reference values.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eAesthetically, it is in \u003cspan class=\"s1\"\u003e\u003cb\u003eexcellent condition\u003c\/b\u003e\u003c\/span\u003e, with a well-preserved internal structure and still clearly legible lettering.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThe Baldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, defined by balance, musicality, and excellent intelligibility.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe bass is well-controlled and defined, with good presence and articulation. It offers solidity to the low end without weighing down the musical message.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe mid-range is likely the strong point of this production. Vocals appear natural, rich in harmonics, and well-focused in the soundstage.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe treble is open and detailed, but never aggressive. Environmental information and the finest nuances are reproduced with naturalness and fluidity.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe dynamics are quick and lively, with an engaging musical response that enhances both small ensembles and large orchestras.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe soundstage is wide and well-organized, with good depth and correct instrument placement.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p5\"\u003eThis tube is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eTube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eIntegrated hi-fi amplifiers\u003c\/li\u003e\n\n\u003cli\u003eMM and MC phono stages\u003c\/li\u003e\n\n\u003cli\u003eTube DACs\u003c\/li\u003e\n\n\u003cli\u003eBuffers and line stages\u003c\/li\u003e\n\n\u003cli\u003eRestoration of vintage American electronics\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection also makes it suitable for the most sensitive positions in the circuit.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p5\"\u003eBaldwin by Sylvania Gray Plates are also highly valued by musicians for their ability to offer:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eExcellent note definition\u003c\/li\u003e\n\n\u003cli\u003eRich and musical mids\u003c\/li\u003e\n\n\u003cli\u003eNatural dynamic response\u003c\/li\u003e\n\n\u003cli\u003eOpen but not aggressive sound\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eParticularly interesting for guitar amplifiers that require clarity, articulation, and vintage American musicality.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for Audiophiles and Collectors\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eAuthentic \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Gray Plates from the early 1960s\u003c\/b\u003e\u003c\/span\u003e, especially when available with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those who desire the classic vintage American sound.\u003c\/p\u003e\n\u003cp class=\"p5\"\u003eThe combination of:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSYLVANIA Made in USA production\u003c\/li\u003e\n\n\u003cli\u003eGray Plates\u003c\/li\u003e\n\n\u003cli\u003eHalo Getter\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\u003cli\u003eVERY STRONG performance\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003emakes this tube ideal for both quality hi-fi listening and for collectors and enthusiasts of American tube electronics.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 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\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\u003cspan\u003e Gm = 1600 ; Ia = 1.0 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e1600 ; Ia = 1.1 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and compliant for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1 position.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\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\u003cspan\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. \u003c\/span\u003e \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\u003eAesthetic condition:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExcellent – Lettering very well preserved, minimal signs of age. 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:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e312 439 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 439 → 4 (out of three digits) → 1964 - 39 → 39th week of the year\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":47024075964764,"sku":"01621","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/7_077ac0c1-5b77-4139-9cd3-3ec360236e84.jpg?v=1780558256"},{"product_id":"6an8-ge-smoked-glass-gray-plates-o-getter-matched-pair-tubes-made-in-usa","title":"6AN8 GE Smoked Glass Gray Plates O Getter Tested Pair Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6AN8 GE Smoked Glass Gray Plates O Getter\u0026nbsp;Tested Pair Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProduced by\u0026nbsp;General Electric\u0026nbsp;in the USA.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLogos worn as per photo\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTubes tested on AMPLITREX AT-1000\u0026nbsp;Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test Triode: Va = 150, Vg = -3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Triode Gm =\u0026nbsp;4500 ; Ia = 15 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test Pentode: Va = 200V ; Vg2 = 150 ; Vg = -2.2V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Pentode Gm =\u0026nbsp;7800\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eValve 1:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTriode: Gm\u0026nbsp;3700 ; Ia\u0026nbsp;12 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 2:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eTriode: Gm\u0026nbsp;4200 ; Ia\u0026nbsp;12 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 1\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePentode: Gm\u0026nbsp;6000\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 2:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePentode: Gm\u0026nbsp;7500\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003eMicrophone Test\u003cbr\u003eTest for GAS\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\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":"GE","offers":[{"title":"Default Title","offer_id":47036762947932,"sku":"01645V","price":79.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_e8276502-35d7-46dc-b243-86a3d523775f.jpg?v=1693500911"},{"product_id":"5963-ecc82-12au7-hewlett-packard-by-sylvania-gray-plates-halo-getter-long-plates-matched-pair-made-in-usa","title":"5963 ( ECC82 12AU7 WA ) Hewlett-Packard by SYLVANIA Gray Plates Halo Getter Long Plates Matched Pair Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5963 ( ECC82 12AU7 WA ) Hewlett-Packard by SYLVANIA Gray Plates Halo Getter Long Plates Matched Pair\u0026nbsp;\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eReboxed in our custom\u0026nbsp;box\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eProduced by SYLVANIA in the United States of America.\u003c\/span\u003e\u003cbr\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp\u003eTested on\u0026nbsp;AMPLITREX AT-1000 Tube tester:\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 250V, Vg = -8,5V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Gm = 2200 ; Ia = 10.5 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003c\/strong\u003eValve 1:\u003cbr\u003e\u003cspan\u003eSection 1: Gm =\u0026nbsp;2200 ;\u0026nbsp;Ia =\u0026nbsp;9.5 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003eGm =\u0026nbsp;2300 ;\u0026nbsp;Ia =\u0026nbsp;10.0\u0026nbsp;mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eValve 2:\u003cbr\u003eSection 1: Gm =\u0026nbsp;2200 ;\u0026nbsp;Ia =\u0026nbsp;9.0 mA\u003cbr\u003eSection 2:\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eGm =\u0026nbsp;2200\u0026nbsp;;\u0026nbsp;Ia =\u0026nbsp;9.0 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\u003cbr\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":47038828249436,"sku":"01649V","price":39.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_7f4d42c9-5a08-4b57-8032-e57fc846043d.jpg?v=1767623582"},{"product_id":"6au6-ef94-telefunken-same-numbers-gray-plates-square-getter-matched-tubes-made-in-germany","title":"6AU6 ( EF94 ) Telefunken \u003c\u003e Diamond bottom Same Codes Gray Plates Square Getter Matched Tubes Made in Germany","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e\u003cstrong\u003e6AU6 ( EF94 ) Telefunken \u0026lt;\u0026gt; Diamond bottom Same Codes Gray Plates Square Getter Matched Tubes\u003c\/strong\u003e\u003cbr data-mce-fragment=\"1\"\u003e \u003cstrong\u003e\u003cmeta charset=\"utf-8\"\u003eMade in Germany\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eReboxed in Aftermarket box\u003cbr data-mce-fragment=\"1\"\u003e Worn logos as shown in the photo\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eTested on AVO VCM 163 Tube tester:\u003c\/span\u003e\u003cbr\u003e \u003cspan data-mce-fragment=\"1\"\u003eMeasurements taken after a 4-minute warm-up.\u003cbr data-mce-fragment=\"1\"\u003e Voltage Test: Va = 250V, Vg2 = 150V, Vg1 = -1V\u003cbr data-mce-fragment=\"1\"\u003e Average 100% Gm = 5200 ; Ia = 10 mA\u003cbr data-mce-fragment=\"1\"\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eValve 1: Gm 4650; Ia = 8.0 mA\u003cbr data-mce-fragment=\"1\"\u003e Valve 2: Gm 4650; Ia = 8.3 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cspan data-mce-fragment=\"1\"\u003eFurther tests performed:\u003cbr data-mce-fragment=\"1\"\u003e Microphone Test\u003cbr data-mce-fragment=\"1\"\u003e Emission Quality\u003cbr data-mce-fragment=\"1\"\u003e Short Circuit Test\u003c\/span\u003e\u003cbr\u003e \u003cspan data-mce-fragment=\"1\"\u003eGAS Test\u003c\/span\u003e\u003c\/p\u003e","brand":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":47045130289500,"sku":"01654R","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_3966abdb-766d-4c16-b683-1d638fd45459.jpg?v=1693822833"},{"product_id":"6an8a-rca-gray-plates-disc-getter-matched-pair-tubes-made-in-usa","title":"6AN8A RCA NOS NIB Gray Plates Disc Getter Matched Pair Tubes Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cbr\u003e\u003cstrong\u003e6AN8A RCA Gray Plates Disc Getter Matched Pair Tubes\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e\u003c\/strong\u003e\u003cspan\u003eProduced by RCA in the U.S.A.\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLogos worn as per photo\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTubes tested on AMPLITREX AT-1000\u0026nbsp;Tube tester:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test Triode: Va = 150, Vg = -3V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Triode Gm =\u0026nbsp;4500 ; Ia = 15 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test Pentode: Va = 200V ; Vg2 = 150 ; Vg = -2.2V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Pentode Gm =\u0026nbsp;7800\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eTriode: Gm 4000 ; Ia 12.2 mA\u003cbr\u003eValve 2:\u003cbr\u003eTriode: Gm 4300 ; Ia 13.9 mA\u003cbr\u003eValve 1\u003cbr\u003ePentode: Gm 6100\u003cbr\u003eValve 2:\u003cbr\u003ePentode: Gm 6200\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003eMicrophone Test\u003cbr\u003eTest for GAS\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\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":47285416329564,"sku":"01816Y","price":79.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_38bffd45-857b-44e6-b09e-665e3bdcaada.jpg?v=1699457115"},{"product_id":"12ax7-ecc83-amperex-by-philips-heerlen-short-plates-halo-getter-tested-tube-made-in-holland","title":"12AX7 ( ECC83 ) NOS AMPEREX Bugle Boy Short Plates Halo Getter Tested Tube MADE IN HOLLAND '60s","description":"\u003cp\u003e\u003cstrong\u003e12AX7 ( ECC83 ) NOS AMPEREX \u003cmeta charset=\"utf-8\"\u003e\u003c!-- x-tinymce\/html --\u003eBugle Boy Short Plates Halo Getter Tested Tube\u003c\/strong\u003e \u003cstrong\u003eMADE IN HOLLAND '60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"265\" data-end=\"715\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cmeta charset=\"utf-8\"\u003e The 12AX7 \/ ECC83 Amperex Bugle Boy with \u003cstrong data-end=\"255\" data-start=\"239\"\u003eshort plates\u003c\/strong\u003e and \u003cstrong data-end=\"273\" data-start=\"258\"\u003ehalo getter\u003c\/strong\u003e , produced in Heerlen, Holland, in the 1960s, represents one of the most legendary and sought-after versions of this tube. Supplied in \u003cstrong data-end=\"436\" data-start=\"413\"\u003eNOS (New Old Stock)\u003c\/strong\u003e condition and tested, it is famous for its unique combination of technical precision and refined musicality. The famous “Bugle Boy” logo printed on the glass is today an absolute icon in the hi-fi and guitar world, symbolizing a golden age of European production.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"954\" data-end=\"1001\"\u003e\u003cstrong data-start=\"956\" data-end=\"999\"\u003eTimbre characteristics and sound output\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"785\" data-start=\"708\"\u003e\u003cstrong data-end=\"717\" data-start=\"708\"\u003eBass\u003c\/strong\u003e : tight and fast, with impeccable articulation and excellent control.\u003c\/li\u003e\n\u003cli data-end=\"921\" data-start=\"788\"\u003e\u003cstrong data-end=\"796\" data-start=\"788\"\u003eMids\u003c\/strong\u003e : the real Amperex magic: warm, bright and airy, with extraordinary naturalness on vocals and acoustic instruments.\u003c\/li\u003e\n\u003cli data-end=\"1031\" data-start=\"924\"\u003e\u003cstrong data-end=\"932\" data-start=\"924\"\u003eHighs\u003c\/strong\u003e : silky and detailed, never aggressive, with an airy extension that gives brightness and breath.\u003c\/li\u003e\n\u003cli data-end=\"1122\" data-start=\"1034\"\u003e\u003cstrong data-end=\"1046\" data-start=\"1034\"\u003eDynamics\u003c\/strong\u003e : lively and responsive, with excellent micro-detail and consistently smooth rendering.\u003c\/li\u003e\n\u003cli data-end=\"1229\" data-start=\"1125\"\u003e\u003cstrong data-end=\"1139\" data-start=\"1125\"\u003eSoundstage\u003c\/strong\u003e : wide, three-dimensional and realistic, with impeccable separation of musical lines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1525\" data-end=\"1843\"\u003e🎧 \u003cstrong data-start=\"1528\" data-end=\"1544\"\u003eHi-Fi use\u003c\/strong\u003e\u003cbr data-start=\"1544\" data-end=\"1547\"\u003e\u003cmeta charset=\"utf-8\"\u003e Considered one of the best 12AX7s ever, it is perfect as a preamp tube for high-end amplifiers and hi-fi preamps. It provides tonal refinement, transparency, and a sense of naturalness that make it indispensable in the most demanding systems.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"1845\" data-end=\"2135\"\u003e🎸 \u003cstrong data-start=\"1848\" data-end=\"1881\"\u003eUse in music amplifiers\u003c\/strong\u003e\u003cbr data-start=\"1881\" data-end=\"1884\"\u003e\u003cmeta charset=\"utf-8\"\u003e In vintage guitar amps, the Bugle Boy Amperex d\u003cmeta charset=\"utf-8\"\u003e The '60s vibe is legendary: rich harmonics, bright mids, and a touch of sweetness that enhances both clean and slightly overdriven sounds. A must-have for anyone seeking authentic European vintage tone.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"2137\" data-end=\"2263\"\u003e🎯 \u003cstrong data-start=\"2140\" data-end=\"2172\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-start=\"2172\" data-end=\"2175\"\u003e\u003cmeta charset=\"utf-8\"\u003e This NOS version with \u003cstrong data-end=\"1901\" data-start=\"1871\"\u003eshort plates and halo getter\u003c\/strong\u003e , produced and tested in the Heerlen factory, is extremely rare today. The original Bugle Boy logo makes it a collector's item, as well as an absolute reference for those who desire the highest sound quality.\u003cbr\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\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 250V ; Vg = -2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = 1.2 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\u0026nbsp;\u003c\/span\u003eGm = 1500 ; Ia = 1.2 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1400 ; Ia = 1.0 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 Very\u003cmeta charset=\"utf-8\"\u003e Low. Tested and approved for use in hi-fi and guitar amplifiers. Compliant for use in V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show a slight deviation in values; excellent for use in hi-fi and musical applications (guitar) where balanced sections are not specifically required.\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 tubes - Tested and in perfect working order. Shipped 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 Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e absent – Philips Heerlen production for Amperex USA, identifiable by its 1960s construction features\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca 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":47520070304092,"sku":"03140","price":189.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_8eaa71e8-1c74-4656-a74b-e051355b21f1.jpg?v=1758389499"},{"product_id":"12ay7-rca-nos-nib-gray-plates-o-getter-tested-tubes-made-in-usa-3","title":"12AY7 DELCO by RCA NOS NIB Gray Plates O Getter Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AY7 DELCO by RCA NOS NIB Gray Plates O Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003e MADE IN USA\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -4V, Vf = 6.3V\u003cbr\u003eAverage 100% Gm = 1700 ;\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eIa = 3.0 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSection 1: \u003cmeta charset=\"utf-8\"\u003eGm =\u0026nbsp;1450 ;\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eIa =\u0026nbsp;2.3 mA\u003cbr\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003eGm =\u0026nbsp;1450 ;\u0026nbsp;\u003cmeta charset=\"utf-8\"\u003eIa =\u0026nbsp;2.5 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\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\u003c\/p\u003e","brand":"DELCO","offers":[{"title":"Default Title","offer_id":47578528940380,"sku":"01967","price":89.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_566186ec-5b86-444b-b5f2-b394e71db5b3.jpg?v=1706106140"},{"product_id":"12ax7-toshiba-labeled-baldwin-short-plate-o-matched-tubes-made-in-japan","title":"12AX7 ( ECC83 ) TOSHIBA labeled Baldwin Short Plate O Tested Tubes Made in Japan","description":"\u003cp\u003e\u003cstrong\u003e12AX7 (ECC83) TOSHIBA labeled Baldwin Short Plate Halo Getter Matched Tubes Made in Japan\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMade in Japan\u003c\/strong\u003e, these 12AX7 (ECC83) TOSHIBA tubes, labeled Baldwin with Short Plate and Halo Getter, are a matched NOS pair ideal for tube amplifiers and Hi-Fi applications. These tubes deliver a balanced and detailed sound, perfect for high-fidelity audio applications.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eSound Description:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eLow frequencies:\u003c\/strong\u003e Controlled and precise, with defined bass providing a solid and stable foundation.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMid frequencies:\u003c\/strong\u003e Clear and natural, ideal for enhancing vocals and instruments, maintaining transparency that enriches the sound quality.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHigh frequencies:\u003c\/strong\u003e Crystal-clear and non-fatiguing, with balanced brilliance highlighting details without being intrusive.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOverall sound signature:\u003c\/strong\u003e These TOSHIBA 12AX7 tubes offer a wide and articulate soundstage, with balanced reproduction that accentuates every detail.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003eAmplitrex AT-1000 Tube tester\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -2V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100% Gm = 1600 ; Ia = 1.2 mA\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result: VERY STRONG\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1400 ; Ia = 1.0 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 1400 ; Ia = 1.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1300 ; Ia = 0.9 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 1400 ; Ia = 1.1 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 3:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1300 ; Ia = 0.9 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 1500 ; Ia = 1.1 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMicrophony Test\u003c\/li\u003e\n\u003cli\u003eEmission Quality Test\u003c\/li\u003e\n\u003cli\u003eShort Circuit Test\u003c\/li\u003e\n\u003cli\u003eGAS Test\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eNOS\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e P28064-09C\u003cmeta charset=\"utf-8\"\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":"TOSHIBA","offers":[{"title":"Default Title","offer_id":47599694283100,"sku":"01976","price":97.35,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_20fd1e57-1db2-4f2b-a0fc-7c659782ec48.jpg?v=1731077126"},{"product_id":"12ax7-ecc83-toshiba-labeled-baldwin-organs-long-plates-o-getter-matched-tubes-made-in-japan","title":"12AX7 ( ECC83 ) TOSHIBA Labeled Baldwin Organs Long Plates O Getter Matched Tubes Made in JAPAN","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AX7 ( ECC83 ) TOSHIBA Labeled Baldwin Organs Long Plates O Getter Matched Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in\u0026nbsp;JAPAN\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eLabeled\u0026nbsp;for Baldwin Organs\u003cbr\u003eMade by TOSHIBA, in JAPAN\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eLow Noise \u0026amp;\u0026nbsp;Microphonics\u003cbr\u003eSame manufacturing batch\u003cbr\u003eLogos worn as per photo\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTested on\u0026nbsp;AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -2V, Vf = 6.3V\u003cbr\u003eAverage 100% Gm = 1600 ; Ia = 1.2 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eValve 1:\u003cbr\u003eSection 1: Gm\u0026nbsp;1450 ; Ia =\u0026nbsp;1.1 mA\u003cbr\u003eSection 2: Gm\u0026nbsp;1400 ; Ia =\u0026nbsp;1.1 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm\u0026nbsp;1350 ; Ia =\u0026nbsp;0.9 mA\u003cbr\u003eSection 2: Gm\u0026nbsp;1400 ; Ia = 1.0 mA\u003cbr\u003e\u003cbr\u003eFurther tests performed:\u003cbr\u003eMicrophony 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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TOSHIBA","offers":[{"title":"Default Title","offer_id":47641554288988,"sku":"01996Y","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_4a1f21f7-cad5-448c-9288-9e2b089e4861.jpg?v=1707485275"},{"product_id":"12au7-a-ecc82-rca-long-gray-plates-halo-getter-tested-tubes-made-in-usa","title":"12AU7 A ( ECC82 ) RCA NOS NIB Long Gray Plates Halo Getter Tested Tubes Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AU7 A ( ECC82 ) RCA Long Gray Plates Halo Getter\u0026nbsp;Tested Tubes\u0026nbsp;\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLogos worn as per photo\u003c\/p\u003e\n\u003ch3\u003e\u003cspan style=\"color: #2b00ff;\"\u003e\u003cstrong\u003eTHE PRICE REFERS TO A SELECTED VALVE\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V\u003cbr\u003eAVERAGE 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eValve 1:\u003cbr\u003eSection 1: Gm =\u0026nbsp;2200 ; Ia =\u0026nbsp;10.6 mA\u003cbr\u003eSection 2: Gm =\u0026nbsp;2100 ; Ia =\u0026nbsp;10.0 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm =\u0026nbsp;2300 ; Ia =\u0026nbsp;12.0 mA\u003cbr\u003eSection 2: Gm =\u0026nbsp;2300 ; Ia =\u0026nbsp;12.0 mA\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eValve 3:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1: Gm =\u0026nbsp;2200 ; Ia =\u0026nbsp;10.5 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: Gm =\u0026nbsp;2300 ; Ia =\u0026nbsp;11.2 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eValve 4:\u003cbr\u003eSection 1: Gm =\u0026nbsp;2000\u0026nbsp;; Ia =\u0026nbsp;9.0\u0026nbsp;mA\u003cbr\u003eSection 2: Gm = 2000\u0026nbsp;; Ia =\u0026nbsp;9.0\u0026nbsp;mA\u003cbr\u003eValve 5:\u003cbr\u003eSection 1: Gm =\u0026nbsp;2100\u0026nbsp;; Ia =\u0026nbsp;12.5\u0026nbsp;mA\u003cbr\u003eSection 2: Gm =\u0026nbsp;2200 ; Ia =\u0026nbsp;10.5\u0026nbsp;mA\u003c\/span\u003e \u003cbr\u003e\u003cbr\u003eFurther tests performed:\u003cbr\u003eMicrophony 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","brand":"RCA","offers":[{"title":"Default Title","offer_id":47665995120988,"sku":"02010Y","price":34.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_bb66eab1-4fc1-4d8a-858f-8fe89329255d.jpg?v=1707929965"},{"product_id":"12au7-a-ecc82-ge-nos-nib-gray-plates-halo-getter-matched-quad-tubes-made-in-usa","title":"12AU7 A ( ECC82 ) GE NOS NIB Gray Plates Halo Getter Matched Quad Tubes Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AU7 A ( ECC82 ) GE NOS NIB Gray Plates Halo Getter Matched Quad Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn Original Box\u003cbr\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V\u003cbr\u003eAVERAGE 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eSection 1: Gm = 2000 ; Ia = 8.6 mA\u003cbr\u003eSection 2: Gm = 2000 ; Ia = 8.6 mA\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eValve 2:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 1: Gm = 1950 ; Ia = 8.6 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2: Gm = 1950 ; Ia = 8.6 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eValve 3:\u003cbr\u003eSection 1: Gm = 2000 ; Ia = 8.6 mA\u003cbr\u003eSection 2: Gm = 2000 ; Ia = 8.4 mA\u003cbr\u003eValve 4:\u003cbr\u003eSection 1: Gm = 2000 ; Ia = 8.4 mA\u003cbr\u003eSection 2: Gm = 2000 ; Ia = 8.4 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\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":47731738181980,"sku":"02045X","price":109.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_36425cb1-87d3-4f2a-a7d5-b72b08a738bf.jpg?v=1709307293"},{"product_id":"12au7-a-ecc82-ge-nos-nib-gray-plates-halo-getter-tested-tube-made-in-usa","title":"12AU7 A ( ECC82 ) GE NOS NIB Gray Plates Halo Getter Tested Tube Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AU7 A ( ECC82 ) GE NOS NIB Gray Plates Halo Getter Tested Tube \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIn Original Box\u003cbr\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V\u003cbr\u003eAVERAGE 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 2000 ; Ia = 9.0 mA\u003cbr\u003eSection 2: Gm = 2000 ; Ia = 9.2 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony 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","brand":"GE","offers":[{"title":"Default Title","offer_id":47731993149788,"sku":"02047X","price":26.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_a90a7775-ebf6-4408-99f5-0a39ed111645.jpg?v=1709311536"},{"product_id":"jan-12av7-nos-nib-sylvania-black-plates-halo-getter-tested-tube-made-in-usa","title":"JAN 12AV7 NOS NIB SYLVANIA Black Plates Halo Getter Tested Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eJAN 12AV7 NOS NIB SYLVANIA Black Plates Halo Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eProduced by SYLVANIA - USA.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eVoltage Test: Va = 150V, Vg = -1V\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAverage 100% Gm = 8.5 ; Ia = 18 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSection 1:\u003cmeta charset=\"utf-8\"\u003e Gm = 9.7 ; Ia = 22 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm = 9.1 ; Ia = 19.6 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\u003cbr\u003eGAS Test\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":47734145253724,"sku":"02049","price":16.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_82356e69-e446-487e-b6af-8d504044eabe.jpg?v=1709389346"},{"product_id":"6350-ge-nos-nib-black-plates-oval-plates-o-getter-matched-pair-tubes-made-in-usa","title":"6350 GE NOS NIB Black Plates Oval Plates O Getter Matched Pair Tubes MADE in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6350 GE NOS NIB Black Plates Oval Plates O Getter Matched Pair Tubes \u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE in USA\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eRare Valves\u003cbr\u003eSame manufacturing code: KI\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 150V, Vg = -5V\u003cbr\u003eAVERAGE 100% Gm = 4.6; Ia = 11.0 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eSection 1: Gm = 4.5 ; Ia = 10.0 mA\u003cbr\u003eSection 2: Gm = 4.9 ; Ia = 11.2 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm = 4.6 ; Ia = 10.4 mA\u003cbr\u003eSection 2: Gm = 4.9 ; Ia = 11.4 mA\u003c\/p\u003e\n\u003cp\u003eAdditional tests performed:\u003cbr\u003eTest for Low Noise \u0026amp; Microphony\u003cbr\u003eEmission Quality\u003cbr\u003eTest for Short Circuits\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":47970064400732,"sku":"02131","price":94.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_69b2706a-811f-4488-8429-ff6d49f2df1a.jpg?v=1712847365"},{"product_id":"12au7-ecc82-nos-sylvania-for-baldwin-organ-long-gray-plates-halo-getter-tested-tube-made-in-usa-50s","title":"12AU7 ( ECC82 ) NOS SYLVANIA for Baldwin Organ Long Gray Plates Halo Getter Tested Tube Made in USA '50s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AU7 ( ECC82 ) NOS SYLVANIA for Baldwin Organ Long Gray Plates Halo Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eMade in USA '50s\u0026nbsp;\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSylvania Special Fabrication for \u003cmeta charset=\"utf-8\"\u003eBaldwin Organ Company\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eThe sound can be described as rich, detailed and with good musical response.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan\u003eAverage 100% Gm = 2200; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003cspan\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSection 1: \u003cmeta charset=\"utf-8\"\u003eGm = 2250 ; Ia = 9.5 mA\u003cbr\u003eSection 2: \u003cmeta charset=\"utf-8\"\u003eGm = 2350 ; Ia = 10.9 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eOther tests carried out:\u003cbr\u003eMicrophony test\u003cbr\u003eEmission quality\u003cbr\u003eTest for short circuits\u003cbr\u003eTest for GAS\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":48684347687260,"sku":"02179","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_0e356ec9-bc65-48c8-9146-97ebf9003a08.jpg?v=1715590416"},{"product_id":"7247-mullard-blackburn-ribbed-plates-halo-getter-amplitrex-matched-tubes-made-in-great-britain-copia","title":"7247 ( 12DW7 ) MULLARD Blackburn O Getter Matched Tubes Made in GT. BRITAIN","description":"\u003cp\u003e\u003cstrong\u003e7247 ( 12DW7 ) MULLARD Blackburn O Getter Matched Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN GT. BRITAIN\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eProduced by MULLARD UK in the Blackburn factory for HAMMOND USA.\u003cbr\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSame manufacturing code: 6B2 B6J2\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe offer is for a \"Matched Pair\u003cbr\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test:\u003cbr\u003eVa = 250V, Vg = -8,5V\u003cbr\u003eVa = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 2.2 ; Ia = 10.5 mA\u003cbr\u003eAverage 100% Gm = 1.6 ; t536\u0026gt;TEST RESULT: VERY STRONG\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eSection 1: Gm = 1.9 ; Ia = 10.9 mA\u003cbr\u003eSection 2: Gm = 1.5 ; Ia = 1.0 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm = 1.9 ; Ia = 9.6 mA\u003cbr\u003eSection 2: Gm = 1.4 ; Ia = 0.9 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony 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\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":48686230733148,"sku":"02182","price":79.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_adda7e14-9eae-43ce-a63d-2bfb0e2371ce.jpg?v=1715615827"},{"product_id":"7247-12dw7-mullard-blackburn-o-getter-matched-tubes-made-in-gt-britain-1","title":"7247 ( 12DW7 ) MULLARD Blackburn O Getter Matched Tubes Made in GT. BRITAIN","description":"\u003cp\u003e\u0026nbsp;\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e7247 ( 12DW7 ) MULLARD Blackburn O Getter Matched Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN GT. BRITAIN\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eProduced by MULLARD UK in the Blackburn factory for HAMMOND USA.\u003cbr\u003eLogos worn as per photo\u003c\/p\u003e\n\u003cp\u003eThe offer is for a \"Matched Pair\u003cbr\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test:\u003cbr\u003eVa = 250V, Vg = -8,5V\u003cbr\u003eVa = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 2.2 ; Ia = 10.5 mA\u003cbr\u003eAverage 100% Gm = 1.6 ; t471\u0026gt;TEST RESULT: VERY STRONG\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eSection 1: Gm = 2.0 ; Ia = 9.6 mA\u003cbr\u003eSection 2: Gm = 1.9 ; Ia = 1.2 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm = 2.1 ; Ia = 10.6 mA\u003cbr\u003eSection 2: Gm = 1.7 ; Ia = 1.0 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophony Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cbr\u003e\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":"MULLARD","offers":[{"title":"Default Title","offer_id":48689932173660,"sku":"02186X","price":79.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_48fa86e4-8e47-4f35-b305-f7ccf93b0f46.jpg?v=1715681192"},{"product_id":"12ax7-ecc83-nos-sylvania-gray-plates-halo-getter-labeled-baldwin-tested-balanced-tube-made-in-usa","title":"12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Red Tip Tested Balanced Tube Made in USA","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Made in USA 1960\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – Low Noise \u0026amp; Microphonics – Vintage American Sylvania Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eGeneral Description\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, produced in the United States in 1960, represents one of the most appreciated American interpretations of the renowned ECC83.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eTubes branded\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003ewere intended for high-end electronic organs of the era and were selected by manufacturers who demanded reliability, low noise, and long operational life. Behind the Baldwin brand, in this case, is the renowned\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSYLVANIA Made in USA\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eproduction, recognizable by its construction with\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eGray Plates\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eand\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e, a configuration particularly valued by enthusiasts for its tonal balance and natural musicality.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eEarly 1960s Sylvania Gray Plates are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThis tube has been carefully verified using\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e, resulting in\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eperformance, exceeding nominal reference values.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eAesthetically, it is in\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eexcellent condition\u003c\/b\u003e\u003c\/span\u003e, with a well-preserved internal structure and legible lettering.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eBaldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, distinguished by balance, musicality, and excellent intelligibility.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe bass is well-controlled and defined, with good presence and articulation. It provides a solid low end without weighing down the musical message.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\u003c!--nl--\"\u003e\u003cp class=\"p3\"\u003eThe mid-range is likely the strong suit of this production. Vocals appear natural, rich in harmonics, and well-focused in the soundstage.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe highs are open and detailed, yet never aggressive. Environmental information and the finest nuances are reproduced with naturalness and fluidity.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eDynamics are quick and lively, with an engaging musical response that enhances both small ensembles and large orchestras.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe soundstage is wide and well-organized, with good depth and accurate instrument placement.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p5\"\u003eThis tube is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eTube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eIntegrated hi-fi amplifiers\u003c\/li\u003e\n\n\u003cli\u003eMM and MC phono stages\u003c\/li\u003e\n\n\u003cli\u003eTube DACs\u003c\/li\u003e\n\n\u003cli\u003eBuffers and line stages\u003c\/li\u003e\n\n\u003cli\u003eRestorations of vintage American electronics\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eselection also makes it suitable for the most sensitive positions in the circuit.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p5\"\u003eBaldwin by Sylvania Gray Plates are also highly valued by musicians for their ability to offer:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eExcellent note definition\u003c\/li\u003e\n\n\u003cli\u003eRich and musical mids\u003c\/li\u003e\n\n\u003cli\u003eNatural dynamic response\u003c\/li\u003e\n\n\u003cli\u003eOpen but not aggressive sound\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eParticularly interesting for guitar amplifiers that require clarity, articulation, and vintage American musicality.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for Audiophiles and Collectors\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eAuthentic\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Gray Plates from the early 1960s\u003c\/b\u003e\u003c\/span\u003e, especially when found with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those who desire the classic vintage American sound.\u003c\/p\u003e\n\u003cp class=\"p5\"\u003eThe combination of:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSYLVANIA Made in USA production\u003c\/li\u003e\n\n\u003cli\u003eGray Plates\u003c\/li\u003e\n\n\u003cli\u003eHalo Getter\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\u003cli\u003eVERY STRONG performance\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003emakes this tube ideal for both quality hi-fi listening and for collectors and enthusiasts of American tube electronics.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 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\u003cp\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1600 ; Ia = 1.0 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = 1600 ; Ia = \u003cmeta charset=\"utf-8\"\u003e1.0 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\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\u003cspan\u003e NOS - New Old Stock - Tested and functional - Supplied in our custom box for optimal protection. \u003c\/span\u003e \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\u003eAesthetic Condition:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExcellent – Lettering very well preserved, minimal signs of age. 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:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e312 026 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 026 → 0 (three digits) → 1960 - 26 → 26th week of the year\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":49279174443356,"sku":"02395","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_7c638189-8efb-4c4f-a7f6-a07a361a7b8a.jpg?v=1724913661"},{"product_id":"12au7a-ecc82-nos-sylvania-for-baldwin-long-gray-plates-o-getter-matched-tubes-made-in-usa-50s-copy-copy","title":"12AU7A ( ECC82 ) NOS SYLVANIA for Baldwin Long Gray Plates O Getter Matched Tubes Made in USA '50s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003e\u003cstrong\u003e12AU7A ( ECC82 ) NOS SYLVANIA for Baldwin Long Gray Plates O Getter Matched Tubes\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eMade in USA '50s\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe 12AU7A SYLVANIA labeled Baldwin was produced in the 1950s and was selected specifically for use in equipment made by Baldwin. This involves greater attention to sound quality and special attention to the linearity and reliability of the tube. The sound It could be described as rich, warm and detailed, with a good musical response. It is characterized by a well-controlled bass response, richly detailed mids and clear highs. The harmonics are pleasant and the sound can have a pleasant smoothness or roundness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eSame manufacturing code: ANJ 312 052\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eWorn logos as shown in the photo.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003cbr\u003e\u003c\/strong\u003e Average 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V \u003cstrong\u003e\u003cbr\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eValve 1:\u003cbr\u003eSection 1:\u003cmeta charset=\"utf-8\"\u003e Gm = 2200 ; Ia = 9.2 mA\u003cbr\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm = 2200 ; Ia =\u003cmeta charset=\"utf-8\"\u003e 9.4mA\u003cbr\u003eValve 2:\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003e Section 1:\u003cmeta charset=\"utf-8\"\u003e Gm = 2150 ; Ia = 9.0 mA\u003cbr\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm = 2200 ; Ia = 9.2 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eValve 3:\u003cbr\u003eSection 1:\u003cmeta charset=\"utf-8\"\u003e Gm =\u003cmeta charset=\"utf-8\"\u003e 2150 ; Ia = 8.8 mA\u003cbr\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm =\u003cmeta charset=\"utf-8\"\u003e 2150 ; Ia = 9.2 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eValve 4:\u003cbr\u003eSection 1:\u003cmeta charset=\"utf-8\"\u003e Gm =\u003cmeta charset=\"utf-8\"\u003e 2200 ; Ia = 9.2 mA\u003cbr\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm =\u003cmeta charset=\"utf-8\"\u003e 2200 ; Ia = 9.4 mA\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOther Tests Performed:\u003cbr\u003eMicrophone Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort 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\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":49393743397212,"sku":"02425M","price":79.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_72bae0b2-3d33-4b1b-ac2c-0be5bd822497.jpg?v=1726764267"},{"product_id":"ecc88-6dj8-nos-ge-halo-getter-tested-pair-tubes-made-in-holland-50s-copy","title":"ECC88 ( 6DJ8 ) GE NOS NIB Halo Getter Matched Pair Tubes Made in USA '62","description":"\u003cp\u003e\u003cstrong\u003eECC88 ( 6DJ8 ) GE NOS NIB Halo Getter Matched Pair Tubes Made in USA '62\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"474\" data-start=\"117\"\u003eThe pair of \u003cstrong\u003eECC88 produced by General Electric in 1962\u003c\/strong\u003e , with ring getter (Halo Getter), represents one of the most balanced and versatile American interpretations of this famous double triode. \u003cstrong\u003eThe sound is neutral, controlled and pleasantly musical\u003c\/strong\u003e , with a sound output that favors \u003cstrong\u003etransparency and detail\u003c\/strong\u003e without ever being tiring.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"868\" data-start=\"476\"\u003eThe \u003cstrong\u003ebass\u003c\/strong\u003e is well \u003cstrong\u003eextended and compact\u003c\/strong\u003e , never invasive but present with authority, capable of restoring solidity without compromising speed. The \u003cstrong\u003emidrange is fluid\u003c\/strong\u003e and balanced, with a \u003cstrong\u003enatural timbre\u003c\/strong\u003e that makes voices and solo instruments credible and well defined. The \u003cstrong\u003ehighs\u003c\/strong\u003e are \u003cstrong\u003eairy and delicate\u003c\/strong\u003e , never sharp, and contribute to creating a wide and well-focused soundstage.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1145\" data-start=\"870\"\u003eOverall, these ECC88 GEs deliver a linear and dynamic tone, \u003cstrong\u003esuitable\u003c\/strong\u003e \u003cstrong\u003efor both critical audio applications and more relaxed musical contexts\u003c\/strong\u003e . They are an excellent choice for those looking for a precise but not sterile tube, with a touch of musicality and warmth.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"70\" data-start=\"32\"\u003e🎧 \u003cstrong data-end=\"70\" data-start=\"35\"\u003eUse in Headphone Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"439\" data-start=\"72\"\u003eThe 1962 ECC88 GE performs excellently in headphone amplifiers, thanks to their low noise floor, smooth dynamic response and neutral yet musical timbre. They are particularly appreciated by those who listen to acoustic genres, classical, jazz or high-resolution recordings, where precision and naturalness of timbre are essential.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"769\" data-start=\"441\"\u003eThe low range is compact and well controlled, ideal for maintaining detail even with high sensitivity headphones. The soundstage is well distributed and coherent, with precise imaging and a good sense of depth. The sound always remains clear and defined, without ever becoming fatiguing even after long listening sessions.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"808\" data-start=\"771\"\u003eThey are particularly recommended for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"986\" data-start=\"928\"\u003eHigh-end OTL or Hybrid Tube Amplifiers\u003c\/li\u003e\n\u003cli data-end=\"986\" data-start=\"928\"\u003ePre-phono or DAC with tube stage based on ECC88 \/ 6DJ8\u003c\/li\u003e\n\u003cli data-end=\"986\" data-start=\"928\"\u003eSystems for critical listening in studios or demanding audiophiles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve 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 \u003cspan\u003eVa = 90V ; Vg = -1.2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 12.5 ; Ia = 15.0 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\u003eGm = 14.6 ; Ia = 19.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 15.5 ; Ia = 18.6 mA\u003c\/span\u003e\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\u003eGm = 13.6 ; Ia = 14.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 14.2 ; Ia = 15.2 mA\u003c\/span\u003e\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 Low. Tested and approved for use in hi-fi and headphone 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 - Supplied 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 Excellent – Perfectly preserved writing, 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 62-34 - Manufactured by General Electric USA - 34th week of 1962\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":49400297128284,"sku":"02429M","price":59.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_42a970e6-d50c-4f2e-b4fa-459ea76a1b11.jpg?v=1726850752"},{"product_id":"12ay7-rca-nos-nib-gray-plates-o-getter-tested-tube-made-in-usa-copy","title":"12AY7 RCA NOS NIB Gray Plates Square Getter Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AY7 RCA NOS NIB Gray Plates Square Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -4V, Vf = 6.3V\u003cbr\u003eAverage 100% Gm = 1700 ; Ia = 3.0 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSection 1: Gm = 1600 ; Ia = 2.7 mA\u003cbr\u003eSection 2: Gm = 1500 ; Ia = 2.5 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurther tests performed:\u003cbr\u003eMicrophone Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eScopra perché le nostre valvole sono diverse →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":49419442848092,"sku":"02434M","price":94.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_6584b8c2-fecc-4b6a-9a87-c18e86e3b8b3.jpg?v=1727186673"},{"product_id":"12at7-ecc81-ge-nos-nib-wing-gray-plates-o-getter-tested-tube-made-in-usa","title":"ECC81 ( 12AT7 ) GE NOS NIB Gray Plates Halo Getter Tested Tube MADE IN USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eECC81 ( 12AT7 ) GE NOS NIB Gray Plates Halo Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eManufactured by General Electric in the United States of America\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThese tubes deliver a sound characterized by remarkable clarity and detail, with a well-balanced midrange and an airy and bright high-frequency extension. This version with gray plates has a slightly warm tone, without losing definition, making it perfect for those seeking a balance between precision and musicality. Ideal for Hi-Fi audio applications and musical instruments, they guarantee rich and articulated sound reproduction.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 5.5 ; Ia = 10 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 6.9 ; Ia = 8.8 mA\u003cbr\u003eSection 2: Gm = 5.5 ; Ia = 9.8 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophone Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cbr\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":49424330719580,"sku":"02439","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_1640de2f-b0a1-4477-b207-16c311eab6d4.jpg?v=1727257957"},{"product_id":"6eu7-sylvania-nos-nib-long-gray-plates-halo-getter-tested-pair-tubes-made-in-usa","title":"6EU7 NOS NIB SYLVANIA Matched Pair – Long Gray Plates Halo Getter USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e6EU7 SYLVANIA NOS NIB Long Gray Plates Halo Getter Matched Pair Tubes\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMade by SYLVANIA in the United States of America\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eThese 6EU7 SYLVANIA valves are renowned for offering a particularly balanced and musical sound. Thanks to the particular shape of the plates, these valves are distinguished by a warm and detailed timbre, with a precise and natural reproduction of the medium frequencies. The highs are soft and never strident. , while the low frequencies are well controlled and round, making them ideal for hi-fi amplifiers and high fidelity audio applications.\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValve tested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 1.6 ; Ia = 1.2 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValve 1:\u003cbr\u003eSection 1: Gm = 1.7 ; Ia = 1.1 mA\u003cbr\u003eSection 2: Gm = 1.6 ; Ia = 1.0 mA\u003cbr\u003eValve 2:\u003cbr\u003eSection 1: Gm = 1.7 ; Ia = 1.2 mA\u003cbr\u003eSection 2: Gm = 1.4 ; Ia = 0.9 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophone 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\u003eShipping with protected packaging for greater safety.\u003cbr\u003eRecycled and recyclable paper packaging. Brown paper sealing tape - ECO-KRAFT\u003cbr\u003eEco-friendly - SOLVENT FREE\u003cbr\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":49436556788060,"sku":"02449M","price":109.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_4e5b0d37-e600-4ade-b47c-d4c1ff805f01.jpg?v=1727425102"},{"product_id":"12at7-ecc81-zenith-nos-nib-gray-plates-square-getter-tested-tube-made-in-usa","title":"12AT7 ECC81 NOS NIB ZENITH Tested Tube – Wing Gray Plates USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AT7 ( ECC81 ) ZENITH NOS NIB Wing Gray Plates Square Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMADE IN USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eManufactured by SYLVANIA for ZENITH in the United States of America\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e12AT7 (ECC81) ZENITH NOS NIB Wing Gray Plates Square Getter\u003c\/strong\u003e tubes, manufactured by \u003cstrong\u003eSylvania\u003c\/strong\u003e and labeled for \u003cstrong\u003eZENITH\u003c\/strong\u003e , offer a sound of remarkable quality, characterized by remarkable definition and transparency. Thanks to the wing-shaped \u003cstrong\u003eGray Plates\u003c\/strong\u003e configuration and the \u003cstrong\u003eSquare Getter\u003c\/strong\u003e , these tubes tend to provide an open and bright sound, with excellent separation of sonic details. In the high frequency register, a particular clarity and precision can be noted, making them ideal for those looking for an airy sound free from harshness. The mids are well balanced, with a natural rendition of voices and instruments, while the low frequencies are present but not invasive, ensuring optimal control of the sound without sacrificing depth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -2V\u003cbr\u003eAverage 100% Gm = 5.5 ; Ia = 10 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 6.2 ; Ia = 10.6 mA\u003cbr\u003eSection 2: Gm = 6.3 ; Ia = 10.8 mA\u003c\/p\u003e\n\u003cp\u003eFurther tests performed:\u003cbr\u003eMicrophone Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cbr\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":49438424891740,"sku":"02450M","price":29.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_3585b8ee-2c99-475f-9b90-3f76020e3b07.jpg?v=1727445022"},{"product_id":"12au7-ecc82-nos-philco-long-gray-plates-halo-getter-tested-tube-made-in-usa","title":"12AU7 ECC82 NOS NIB PHILCO Tested Tube – Long Gray Plates Halo Getter Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AU7 ( ECC82 ) NOS NIB PHILCO Long Gray Plates Halo Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eIn Original Box (Note: a closing flap of the box is missing)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe NOS PHILCO Long Gray Plates 12AU7 (ECC82) tubes with Halo Getter, made in the USA, offer a warm and detailed sound signature. Thanks to the long gray plates, these tubes tend to provide a balanced harmonic response with a particularly musical. The sound is characterized by a good presence in the mids, making the signal full and pleasant, ideal for those looking for an engaging but never tiring listening experience. The highs are soft and delicate, without being sharp, while the low frequencies They are well controlled and present, but not intrusive. These tubes are perfect for those who appreciate a natural performance, with a touch of warmth and softness typical of high quality NOS tubes.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003cbr\u003e\u003c\/strong\u003e Average 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V \u003cstrong\u003e\u003cbr\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSection 1:\u003cmeta charset=\"utf-8\"\u003e Gm = 2200 ; Ia = 10.4 mA\u003cbr\u003eSection 2:\u003cmeta charset=\"utf-8\"\u003e Gm = 2100 ; Ia = 9.2 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eOther Tests Performed:\u003cbr\u003eMicrophone Test\u003cbr\u003eEmission Quality\u003cbr\u003eShort Circuit Test\u003cbr\u003eGAS Test\u003cspan\u003e\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":"PHILCO","offers":[{"title":"Default Title","offer_id":49438736056668,"sku":"02451M","price":26.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_2355fab0-78ce-443d-8b47-a90d6dd9dc19.jpg?v=1727447323"},{"product_id":"12au7-a-ecc82-rca-nos-long-gray-plates-halo-getter-matched-tubes-made-in-usa-3","title":"12AU7A ECC82 NOS RCA Tested Tube – Long Gray Plates Halo Getter Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AU7A ( ECC82 ) RCA NOS Long Gray Plates Halo Getter Tested Tube\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThese tubes are renowned for their rich, warm tone, with a smooth, harmonious sound reproduction. They offer extraordinary transparency in the mid-range, combined with deep, controlled bass. The detail in the high frequencies is precise, without ever being fatiguing, making them perfect for extended listening.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWorn logos as per photo\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003eVoltage Test: Va = 250V, Vg = -8.5V\u003cbr\u003eAVERAGE 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 2000 ; Ia = 8.3 mA\u003cbr\u003eSection 2: Gm = 1900 ; Ia = 8.3 mA\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003cbr\u003eFurther tests performed:\u003cbr\u003eMicrophone 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","brand":"RCA","offers":[{"title":"Default Title","offer_id":49467678490972,"sku":"02459U","price":22.5,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_0dd9616b-64f0-4e9d-be9e-725b10ec373e.jpg?v=1727861286"},{"product_id":"12au7-a-ecc82-rca-nos-long-gray-plates-halo-getter-matched-tubes-made-in-usa-4","title":"12AU7A ECC82 NOS RCA Matched Pair Tubes – Long Gray Plates Halo Getter USA","description":"\u003cp\u003e\u003cstrong\u003e12AU7A ( ECC82 ) RCA NOS Long Gray Plates Halo Getter Matched Tubes\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eThese tubes are renowned for their rich, warm tone, with a smooth, harmonious soundstage. They offer extraordinary transparency in the midrange, combined with deep, controlled bass. High-frequency detail is precise, yet never fatiguing, making them perfect for extended listening sessions.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Worn logos as shown in the photo\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eTested on Amplitrex AT-1000 Tube tester:\u003c\/strong\u003e\u003cbr\u003e Voltage Test: Va = 250V, Vg = -8.5V\u003cbr\u003e AVERAGE 100% Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e Valve 1:\u003cbr\u003e Section 1: Gm = 2150 ; Ia = 9.8 mA\u003cbr\u003e Section 2: Gm = 2250 ; Ia = 12.8 mA\u003cbr\u003e Valve 2:\u003cbr\u003e Section 1: Gm = 2050 ; Ia = 9.4 mA\u003cbr\u003e Section 2: Gm = 2250 ; Ia = 12.6 mA\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e Further tests performed:\u003cbr\u003e Microphone Test\u003cbr\u003e Emission Quality\u003cbr\u003e Short Circuit Test\u003cbr\u003e GAS 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","brand":"RCA","offers":[{"title":"Default Title","offer_id":49469141746012,"sku":"02460U","price":44.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_82a8474f-ef52-42fa-b067-601cdebd1537.jpg?v=1727877296"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/collections\/preamp-tubes-662632.jpg?v=1657112580","url":"https:\/\/vacuumtubestreasures.com\/en-bg\/collections\/preamp-tubes-en.oembed?page=15","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}