{"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","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/12au7-ecc82-sylvania-gray-plates-square-getter-matched-tubes-made-in-usa-47-en","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}