{"product_id":"12at7wa-ecc81-nos-sylvania-matched-pair-black-plates-halo-getter-made-in-usa","title":"12AT7WA E81CC 6201 NOS SYLVANIA Matched Pair - Black Plates Halo Getter Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AT7WA ( E81CC 6201 ) NOS SYLVANIA Matched Pair - Black Plates Halo Getter Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"277\" data-end=\"699\"\u003eThis \u003cstrong data-start=\"284\" data-end=\"328\"\u003ematched pair of 12AT7WA (E81CC \/ 6201)\u003c\/strong\u003e produced by \u003cstrong data-start=\"341\" data-end=\"357\"\u003eSylvania USA\u003c\/strong\u003e represents one of the most stable and refined military versions of the American 12AT7 series.\u003cbr data-start=\"450\" data-end=\"453\"\u003eThe abbreviation \u003cstrong data-start=\"462\" data-end=\"468\"\u003eWA\u003c\/strong\u003e indicates the military qualification (JAN \/ Joint Army-Navy), with more stringent tolerance specifications than the standard version, intended for use in telecommunications, measuring instruments and professional audio equipment.\u003c\/p\u003e\n\u003cp data-start=\"701\" data-end=\"1133\"\u003eThe \u003cstrong data-start=\"720\" data-end=\"751\"\u003eblack plate\u003c\/strong\u003e , halo \u003cstrong data-start=\"771\" data-end=\"786\"\u003egetter\u003c\/strong\u003e construction and identical manufacturing codes ensure uniform behavior, long operating life and extraordinary tonal consistency between the two examples.\u003cbr data-start=\"942\" data-end=\"945\"\u003eThis is a \u003cstrong data-start=\"969\" data-end=\"992\"\u003eNOS – New Old Stock\u003c\/strong\u003e pair, carefully \u003cstrong data-start=\"1008\" data-end=\"1019\"\u003ematched\u003c\/strong\u003e for transconductance and anode current, ideal for precision hi-fi applications and balanced driver stages.\u003c\/p\u003e\n\u003ch3 data-start=\"1140\" data-end=\"1170\"\u003eSound Characteristics\u003c\/h3\u003e\n\u003cp data-start=\"1171\" data-end=\"1748\"\u003e\u003cstrong data-start=\"1171\" data-end=\"1181\"\u003eBass:\u003c\/strong\u003e Fast, precise, and well-articulated; the lower range is controlled and clean, with excellent rhythm and coherence.\u003cbr data-start=\"1291\" data-end=\"1294\"\u003e\u003cstrong data-start=\"1294\" data-end=\"1303\"\u003eMids:\u003c\/strong\u003e clear and linear, with a natural and transparent rendering of voices and acoustic instruments. \u003cbr data-start=\"1396\" data-end=\"1399\"\u003e\u003cstrong data-start=\"1399\" data-end=\"1408\"\u003eHighs:\u003c\/strong\u003e refined, airy and never sharp; the frequency response is extended and perfectly balanced.\u003cbr data-start=\"1505\" data-end=\"1508\"\u003e\u003cstrong data-start=\"1508\" data-end=\"1521\"\u003eDynamics:\u003c\/strong\u003e Lively and fluid, with excellent transient tracking and harmonic microdetails.\u003cbr data-start=\"1612\" data-end=\"1615\"\u003e\u003cstrong data-start=\"1615\" data-end=\"1630\"\u003eSoundstage:\u003c\/strong\u003e wide and stable, with excellent focus and realistic depth, typical of Sylvania construction.\u003c\/p\u003e\n\u003ch3 data-start=\"1755\" data-end=\"1790\"\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"1791\" data-end=\"2143\"\u003ePerfect for \u003cstrong data-start=\"1804\" data-end=\"1863\"\u003epreamps and driver stages of high-end amplifiers\u003c\/strong\u003e , where accuracy, low noise and coherence between channels are essential.\u003cbr data-start=\"1935\" data-end=\"1938\"\u003eThe combination of black plates and halo getter gives a balanced, transparent and musical timbre, ideal for high-resolution systems and for those seeking natural and fatigue-free listening.\u003c\/p\u003e\n\u003ch3 data-start=\"2150\" data-end=\"2188\"\u003e🎸 Use in Music Amplifiers\u003c\/h3\u003e\n\u003cp data-start=\"2189\" data-end=\"2459\"\u003eAlso excellent for \u003cstrong data-start=\"2210\" data-end=\"2261\"\u003eboutique or studio guitar amplifiers\u003c\/strong\u003e , where they ensure fast dynamic response, low microphonics and a warm but defined harmonic character.\u003cbr data-start=\"2367\" data-end=\"2370\"\u003eIdeal for V1 or driver positions for vintage Fender, Marshall or Matchless amplifiers.\u003c\/p\u003e\n\u003chr data-start=\"2461\" data-end=\"2464\"\u003e\n\u003ch3 data-start=\"2466\" data-end=\"2503\"\u003e🎯 Note for Audiophiles and Technicians\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"2506\" data-end=\"2567\"\u003e\u003cstrong data-start=\"2506\" data-end=\"2565\"\u003eSylvania USA Production – Military Specification WA\/6201\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2570\" data-end=\"2629\"\u003e\u003cstrong data-start=\"2570\" data-end=\"2627\"\u003eMatched Pair – identical codes and balanced parameters\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2632\" data-end=\"2689\"\u003e\u003cstrong data-start=\"2632\" data-end=\"2687\"\u003eBlack Plates – sturdy construction, natural tone\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2692\" data-end=\"2740\"\u003e\u003cstrong data-start=\"2692\" data-end=\"2738\"\u003eHalo Getter – stability and durability over time\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2743\" data-end=\"2800\"\u003ePerfect for \u003cstrong data-start=\"2769\" data-end=\"2798\"\u003eHi-Fi, Broadcast and Studio\u003c\/strong\u003e applications\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 = 250V ; Vg = -2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 5.5 ; Ia = 10.0 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\u003e\u0026nbsp;\u003c\/span\u003eGm = 5.9 ; Ia = 11.8 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 5.4 ; Ia = 9.4 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 = 5.8 ; Ia = 11.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 5.8 ; Ia = 11.3 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.\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 7152 → RMA\/EIA Open Date Code → manufactured week 52 of 1971\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":55858573410652,"sku":"03241","price":69.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_e4b226f3-277d-4cdf-9791-e7f00001d5fa.jpg?v=1761910442","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12at7wa-ecc81-nos-sylvania-matched-pair-black-plates-halo-getter-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}