{"product_id":"5y3-gt-5z2p-nu-national-union-black-plates-square-getter-tube-rectifier-made-in-usa-50s","title":"5Y3GT 5Z2P NU National Union – Black Plates Square Getter Rectifier Tube USA 1950s","description":"\u003cp\u003e\u003cstrong\u003e5Y3 GT ( 5Z2P ) NU National Union NOS Black Plates Square Getter Tube Rectifier Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"381\"\u003eThe \u003cstrong data-start=\"50\" data-end=\"97\"\u003e5Y3GT (5Z2P) NU National Union Black Plates\u003c\/strong\u003e \u003cstrong data-start=\"102\" data-end=\"119\"\u003eSquare Getter\u003c\/strong\u003e rectifier, made in the \u003cstrong data-start=\"136\" data-end=\"166\"\u003eUSA in the 1950s\u003c\/strong\u003e , is a tube prized for its ability to provide \u003cstrong data-start=\"228\" data-end=\"264\"\u003esmooth, natural rectification\u003c\/strong\u003e , influencing the amplifier's response with well-regulated voltage and stable current delivery.\u003c\/p\u003e\n\u003cul data-start=\"383\" data-end=\"955\"\u003e\n\u003cli data-start=\"383\" data-end=\"515\"\u003e\u003cstrong data-start=\"385\" data-end=\"394\"\u003eBass\u003c\/strong\u003e : Smooth and controlled, with good articulation that ensures clean reproduction without excessive bloating.\u003c\/li\u003e\n\u003cli data-start=\"516\" data-end=\"669\"\u003e\u003cstrong data-start=\"518\" data-end=\"526\"\u003eMids\u003c\/strong\u003e : Natural and slightly warm, with a smooth presentation and \u003cstrong data-start=\"593\" data-end=\"625\"\u003eexcellent tonal coherence\u003c\/strong\u003e , making the sound enveloping and musical.\u003c\/li\u003e\n\u003cli data-start=\"670\" data-end=\"800\"\u003e\u003cstrong data-start=\"672\" data-end=\"680\"\u003eHighs\u003c\/strong\u003e : Harmonious and never aggressive, with a pleasant extension that preserves detail without introducing listening fatigue.\u003c\/li\u003e\n\u003cli data-start=\"801\" data-end=\"955\"\u003e\u003cstrong data-start=\"803\" data-end=\"815\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"817\" data-end=\"842\"\u003eSmooth and progressive\u003c\/strong\u003e , with excellent transient management that gives \u003cstrong data-start=\"897\" data-end=\"931\"\u003ea touch of vintage musicality\u003c\/strong\u003e to the overall sound.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"957\" data-end=\"1298\"\u003eThe \u003cstrong data-start=\"960\" data-end=\"994\"\u003eNU National Union Black Plates\u003c\/strong\u003e from the 50s are sought after for their \u003cstrong data-start=\"1037\" data-end=\"1096\"\u003esturdy construction and smooth, linear rectification\u003c\/strong\u003e , making them ideal for both \u003cstrong data-start=\"1124\" data-end=\"1190\"\u003ehi-fi amplifiers and vintage guitar amplifiers\u003c\/strong\u003e , where a \u003cstrong data-start=\"1210\" data-end=\"1250\"\u003ewell-regulated, slightly compressed\u003c\/strong\u003e voltage contributes to a \u003cstrong data-start=\"1275\" data-end=\"1295\"\u003ewarm, musical\u003c\/strong\u003e sound.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eFunke W19\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 100V ; Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 77.5 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 75 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 82 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Standard. Tested and compliant for use in hi-fi and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage - Tested and working - In our custom box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e Very Good – Clearly legible writing with minor signs of erosion. Very small surface crack on the base, barely noticeable and with no impact on operation. See photo.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e JC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"National Union","offers":[{"title":"Default Title","offer_id":54019705405788,"sku":"02771Y","price":2500.0,"currency_code":"ALL","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_b01286b8-e554-4d38-a3b0-eb44db13f6d1.jpg?v=1740138647","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/5y3-gt-5z2p-nu-national-union-black-plates-square-getter-tube-rectifier-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}