{"product_id":"5y3gt-5z2p-sylvania-nos-nib-matched-pair-rectifiers-tubes-black-plates-usa","title":"5Y3GT \/ 5Z2P SYLVANIA Black Plate Rectifier Tubes, Matched Pair, Made in the USA","description":"\u003ch3\u003e\u003cstrong\u003e5Y3GT \/ 5Z2P SYLVANIA Black Plates Halo Getter Tubes Rectifiers Made in USA\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eFunke W19 Tested – VERY STRONG \u003cmeta charset=\"utf-8\"\u003e– Matched Pair \u003cmeta charset=\"utf-8\"\u003e– Vintage American Sylvania Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eFunke W19 \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 = 100V ; Vf = 5V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e Ia = 77.5 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 88 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 85 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 88 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIa = 85 mA\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\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\u003eShort Circuits and GAS:\u003c\/strong\u003e None.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eThis pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSylvania 5Y3GT \/ 5Z2P Made in USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes makes a particularly interesting match for anyone seeking two vintage American rectifiers with truly uniform electrical characteristics. The construction with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eblack plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehalo getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, GT bulb and octal base is accompanied by the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSylvania Export Quality\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e markings, which can be traced back approximately to production in the 1960s.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe main strength is the exceptional matching of the values: both tubes measured exactly \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e88 mA and 85 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The pair is therefore perfectly matched not only in the overall emission value, but also in the behavior of the individual sections. An ideal selection for equipment that uses two rectifiers and in which uniformity, reliability, and operational consistency are particularly important.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared to the 100% average,\u003c\/span\u003e\u003cspan\u003e all sections show a clearly higher emission, confirming an electrical condition that is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every strong, stable, and regular\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The internal balance is also excellent: the difference of only \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e between the two sections of each tube promotes uniform rectification and balanced power supply operation. The tests also ruled out the presence of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eshort circuits and gas\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5Y3GT\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes are used in guitar amplifier power supplies, radio equipment, hi-fi systems, and numerous vintage tube electronics. The pair can also be used in equipment designed for the equivalent \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5Z2P\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e rectifier, after verifying the specifications indicated by the manufacturer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ematched pair of Sylvania tubes of authentic American production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, difficult to replicate due to the identity of the values: two tubes with uniform construction, emission well above average, and perfectly matched with each other. A choice of particular quality for careful restorations and equipment in which two reliable and consistent rectifiers are required.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Very good – Markings clearly legible with slight signs of age. On one of the two specimens, there is an aesthetic irregularity in the getter deposit, which does not affect the correct operation or the electrical matching of the pair. Both tubes have been regularly tested. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003eCode not decipherable. Sylvania Export Quality. Production attributable approximately to the 1960s based on construction characteristics.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability, and longevity\" 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":59635882033500,"sku":"03896","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_752ef792-c527-4422-a74c-9c45714a25e0.jpg?v=1792846844","url":"https:\/\/vacuumtubestreasures.com\/en-pt\/products\/5y3gt-5z2p-sylvania-nos-nib-matched-pair-rectifiers-tubes-black-plates-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}