{"product_id":"12at7-ecc81-sylvania-nos-black-square-plates-halo-getter-export-quality","title":"12AT7 \/ ECC81 SYLVANIA NOS – Black Square Plates Halo Getter – Export Quality Made in USA","description":"\u003cp\u003e\u003cstrong\u003e12AT7 \/ ECC81 SYLVANIA NOS – Black Square Plates Halo Getter – Export Quality Made in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"0\" data-end=\"623\"\u003eThis \u003cstrong data-start=\"37\" data-end=\"77\"\u003epair of NOS 12AT7 \/ ECC81 SYLVANIA\u003c\/strong\u003e , \u003cstrong data-start=\"79\" data-end=\"94\"\u003eMade in USA\u003c\/strong\u003e , belongs to an \u003cstrong data-start=\"113\" data-end=\"141\"\u003eExport Quality selection\u003c\/strong\u003e , intended for the most demanding markets in terms of construction standards and reliability. The configuration with \u003cstrong data-start=\"240\" data-end=\"263\"\u003eblack square plates\u003c\/strong\u003e and \u003cstrong data-start=\"266\" data-end=\"281\"\u003ehalo getter\u003c\/strong\u003e identifies one of the most appreciated versions of the vintage Sylvania ECC81, renowned for its electrical coherence, stability over time and sonic refinement. \u003cbr data-start=\"432\" data-end=\"435\"\u003eFrom the very first notes, the whole thing conveys the feeling of a carefully selected, solid, and well-finished component, capable of enhancing quality equipment with an authentically American character.\u003c\/p\u003e\n\u003cp data-start=\"625\" data-end=\"653\"\u003e\u003cstrong data-start=\"627\" data-end=\"653\"\u003eSound Characteristics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"655\" data-end=\"820\"\u003e\u003cstrong data-start=\"655\" data-end=\"664\"\u003eBass\u003c\/strong\u003e\u003cbr data-start=\"664\" data-end=\"667\"\u003eCompact and well-controlled. The low end is tidy and precise, with a dry response that supports the rhythm without weighing down the musical message.\u003c\/p\u003e\n\u003cp data-start=\"822\" data-end=\"1009\"\u003e\u003cstrong data-start=\"822\" data-end=\"830\"\u003eMedium\u003c\/strong\u003e\u003cbr data-start=\"830\" data-end=\"833\"\u003eClear, present, and very natural. Voices emerge with good intelligibility and body, while acoustic and jazz instruments benefit from a clean and coherent harmonic texture.\u003c\/p\u003e\n\u003cp data-start=\"1011\" data-end=\"1190\"\u003e\u003cstrong data-start=\"1011\" data-end=\"1019\"\u003eHigh\u003c\/strong\u003e\u003cbr data-start=\"1019\" data-end=\"1022\"\u003eOpen and bright, yet well-integrated. The highs are elegant, free of harshness, with a sense of air and detail that makes listening smooth and enjoyable.\u003c\/p\u003e\n\u003cp data-start=\"1192\" data-end=\"1343\"\u003e\u003cstrong data-start=\"1192\" data-end=\"1204\"\u003eDynamics\u003c\/strong\u003e \u003cbr data-start=\"1204\" data-end=\"1207\"\u003ePrompt and smooth. The response is lively yet composed, with balanced microdynamics that keep the music alive without being aggressive.\u003c\/p\u003e\n\u003cp data-start=\"1345\" data-end=\"1490\"\u003e\u003cstrong data-start=\"1345\" data-end=\"1359\"\u003eSoundstage\u003c\/strong\u003e\u003cbr data-start=\"1359\" data-end=\"1362\"\u003eStable and well-focused. The soundstage is clear, with credible separation of levels and a realistic presentation.\u003c\/p\u003e\n\u003cp data-start=\"1492\" data-end=\"1548\"\u003e🎧 \u003cstrong data-start=\"1495\" data-end=\"1532\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003cbr data-start=\"1532\" data-end=\"1535\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1551\" data-end=\"1587\"\u003epreamplifiers and line stages,\u003c\/li\u003e\n\u003cli data-start=\"1590\" data-end=\"1625\"\u003edrivers and medium gain stages,\u003c\/li\u003e\n\u003cli data-start=\"1628\" data-end=\"1704\"\u003evintage and modern hi-fi systems that require transparency and reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1706\" data-end=\"1798\"\u003eThe Sylvania sound signature is best expressed on jazz, vocal, classical and fine listening.\u003c\/p\u003e\n\u003cp data-start=\"1800\" data-end=\"1852\"\u003e🎸 \u003cstrong data-start=\"1803\" data-end=\"1836\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003cbr data-start=\"1836\" data-end=\"1839\"\u003eExcellent for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1855\" data-end=\"1896\"\u003eguitar amplifiers and instruments,\u003c\/li\u003e\n\u003cli data-start=\"1899\" data-end=\"1935\"\u003eV2\/V3 positions and driver stages,\u003c\/li\u003e\n\u003cli data-start=\"1938\" data-end=\"2000\"\u003ecircuits that require signal definition and control.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2002\" data-end=\"2056\"\u003eThey offer a clean, musical and very balanced sound.\u003c\/p\u003e\n\u003cp data-start=\"2058\" data-end=\"2203\"\u003e🎯 \u003cstrong data-start=\"2061\" data-end=\"2093\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2206\" data-end=\"2268\"\u003e\u003cstrong data-start=\"2210\" data-end=\"2265\"\u003eAmerican production selected for export\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"2271\" data-end=\"2328\"\u003ehigh-level internal construction and great stability\u003c\/li\u003e\n\u003cli data-start=\"2331\" data-end=\"2376\"\u003ebalanced, bright and refined timbre \u003cbr\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2462\" data-end=\"2647\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eAn ideal choice for those who want \u003cstrong data-start=\"2497\" data-end=\"2525\"\u003enot only a NOS tube\u003c\/strong\u003e , but \u003cstrong data-start=\"2530\" data-end=\"2590\"\u003ea reliable and musically satisfying sound experience\u003c\/strong\u003e , faithful to the spirit of the best Sylvania productions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValves 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\u003cmeta charset=\"utf-8\"\u003eGm = 5.5 ; Ia = 10 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\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 = 5.8, ; Ia = 11.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 6.1 ; Ia = 10.8 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 = 6.0 ; Ia = 11.6 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 6.2 ; Ia = 12.4 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 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\u003eAesthetic conditions:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eOne of the two tubes has completely lost its original silkscreen print on the glass. This is \u003cstrong data-start=\"1093\" data-end=\"1115\"\u003epurely cosmetic\u003c\/strong\u003e and common on NOS tubes from this era, especially those with fragile varnishes or those that have been stored for a long time.\u003cbr data-start=\"1228\" data-end=\"1231\"\u003eThe identification as an \u003cstrong data-start=\"1256\" data-end=\"1290\"\u003eoriginal SYLVANIA Made in USA\u003c\/strong\u003e is confirmed without any doubt by the \u003cstrong data-start=\"1329\" data-end=\"1350\"\u003einternal structure\u003c\/strong\u003e , materials and construction, perfectly consistent with Sylvania Export Quality production. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable. Year of manufacture detected by internal structure - Made in the 1960s.\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":56454422430044,"sku":"03355","price":109.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_d4705b5b-6f21-4bcb-bca4-249e51066487.jpg?v=1768318609","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/12at7-ecc81-sylvania-nos-black-square-plates-halo-getter-export-quality","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}