{"product_id":"5963-ecc82-12au7-sylvania-halo-getter-long-plates-tested-balanced-tube-made-in-usa-50s","title":"5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5963 ( 12AU7 ) SYLVANIA Halo Getter Long Plates Tested Tube Made in USA '50s\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"770\" data-start=\"364\"\u003eThis \u003cstrong data-end=\"404\" data-start=\"371\"\u003e5963 (12AU7 \/ ECC82) SYLVANIA\u003c\/strong\u003e , produced in the USA in the 1950s, represents one of the most refined and technically sound interpretations of the vintage American 12AU7.\u003cbr data-end=\"556\" data-start=\"553\"\u003eThe construction with \u003cstrong data-end=\"590\" data-start=\"575\"\u003elong plates\u003c\/strong\u003e and \u003cstrong data-end=\"608\" data-start=\"593\"\u003ehalo getters\u003c\/strong\u003e is typical of high-quality Sylvania productions, appreciated for the balance between operational reliability, sonic transparency and linear behavior over time.\u003c\/p\u003e\n\u003cp data-end=\"982\" data-start=\"772\"\u003e\u003cstrong data-end=\"805\" data-start=\"780\"\u003eTested and selected\u003c\/strong\u003e valve, with stable emission and low background noise, designed for hi-fi and professional audio applications where coherence, control and musicality without excesses are required.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1196\" data-start=\"1058\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBass:\u003c\/strong\u003e Precise and well-controlled. The low range is dry, uncluttered, and free of artificial emphasis, favoring clarity and rhythmic articulation.\u003c\/li\u003e\n\u003cli data-end=\"1408\" data-start=\"1213\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eMids:\u003c\/strong\u003e Open and natural. Voices and acoustic instruments are well-proportioned, with a clean, clear reproduction, typically Sylvania: less \"warm\" than RCA, but more neutral and transparent.\u003c\/li\u003e\n\u003cli data-end=\"1551\" data-start=\"1425\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eHighs:\u003c\/strong\u003e Clear and well-extended. The high end is airy and defined, without harshness, with elegant detail that doesn't tire the listener.\u003c\/li\u003e\n\u003cli data-end=\"1699\" data-start=\"1572\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eDynamics:\u003c\/strong\u003e Balanced and smooth. The response is prompt but composed, ideal for line stages, drivers, and signal control sections.\u003c\/li\u003e\n\u003cli data-end=\"1858\" data-start=\"1722\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eSoundstage:\u003c\/strong\u003e A tidy and well-focused scene. Correct separation of sound planes and a stable image, with a realistic and coherent presentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1884\" data-end=\"1924\"\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"1917\" data-start=\"1906\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1955\" data-start=\"1920\"\u003epreamplifiers and line stages\u003c\/li\u003e\n\u003cli data-end=\"1994\" data-start=\"1958\"\u003ebuffers and coupling circuits\u003c\/li\u003e\n\u003cli data-end=\"2065\" data-start=\"1997\"\u003eVintage and modern hi-fi amplifiers compatible with 12AU7 \/ 5963\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2232\" data-start=\"2067\"\u003eParticularly suitable for \u003cstrong data-end=\"2144\" data-start=\"2096\"\u003enon-critical or moderate gain positions\u003c\/strong\u003e , where operational stability, low overall noise and timbral coherence are required.\u003c\/p\u003e\n\u003ch3 data-start=\"2243\" data-end=\"2293\"\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"2287\" data-start=\"2276\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2345\" data-start=\"2290\"\u003e\u003cstrong data-end=\"2313\" data-start=\"2303\"\u003edriver\u003c\/strong\u003e positions, \u003cstrong data-end=\"2333\" data-start=\"2315\"\u003ephase inverter\u003c\/strong\u003e or V2 \/ V3\u003c\/li\u003e\n\u003cli data-end=\"2384\" data-start=\"2348\"\u003eguitar and bass amplifiers\u003c\/li\u003e\n\u003cli data-end=\"2436\" data-start=\"2387\"\u003eapplications in studio and professional contexts\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2672\" data-start=\"2438\"\u003eIt offers reliable, controlled operation, with low noise and predictable response.\u003cbr data-end=\"2534\" data-start=\"2531\"\u003eIt is recommended to avoid using it in \u003cstrong data-end=\"2603\" data-start=\"2568\"\u003eV1 or in very high gain stages\u003c\/strong\u003e , where specifically selected low-noise tubes are preferable.\u003c\/p\u003e\n\u003ch3 data-start=\"2566\" data-end=\"2601\"\u003e🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eA well-built and well-tested \u003cstrong data-end=\"2745\" data-start=\"2719\"\u003e1950s Sylvania 5963\u003c\/strong\u003e , designed for those looking for \u003cstrong data-end=\"2839\" data-start=\"2799\"\u003eneutrality, control and reliability\u003c\/strong\u003e , with the classic American approach that is more linear and transparent than its “warmer” counterparts.\u003cbr data-end=\"2944\" data-start=\"2941\"\u003eA rational and musical choice for hi-fi systems and professional applications.\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:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2200 ; Ia = 9.4 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2100 ; Ia = 8.4 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 Microphonics and Noise: Very 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\u003eBalance:\u003c\/strong\u003e The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.\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 - Comes 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 Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable – Made by SYLVANIA USA, identifiable by construction features. 1950s\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":46757909594460,"sku":"01465","price":19.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_adf9bc4b-da4b-4d8a-8e13-b5f37d7acf5e.jpg?v=1767635953","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/5963-ecc82-12au7-sylvania-halo-getter-long-plates-tested-balanced-tube-made-in-usa-50s-en","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}