{"product_id":"5963-12au7-rca-matched-pair-long-black-plates-foil-getter-amplitrex-tested-1","title":"5963 ( 12AU7 ) RCA Matched Pair Long Black Plates Foil Getter AMPLITREX Tested","description":"\u003cp\u003e\u003cstrong\u003e5963 (12AU7 \/ ECC82) RCA – Matched Pair – Black Plates – Foil Getter\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – Made in USA – 1956\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis \u003cstrong\u003ematched pair of RCA 5963 (12AU7 \/ ECC82), Made in USA 1956\u003c\/strong\u003e , belongs to one of the most fascinating and musical productions of RCA of the 1950s. The construction with \u003cstrong\u003eblack plates and foil getters\u003c\/strong\u003e is typical of the superior quality series, created for professional applications and today sought after for their warm, authoritative and incredibly refined sonic character.\u003c\/p\u003e\n\u003cp\u003eThe valves are \u003cstrong\u003eAMPLITREX Tested\u003c\/strong\u003e and carefully selected as a \u003cstrong\u003eMatched Pair\u003c\/strong\u003e : the overall behavior is coherent, stable and silent, with a performance that immediately conveys the feeling of a “special”, uncommon component.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eBass:\u003c\/strong\u003e Compact, controlled, and well-articulated. The low end is tidy and precise, with a dry feel that promotes clarity and rhythm.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMids:\u003c\/strong\u003e Balanced and natural. Vocals are credible and well-focused, with a harmonic texture that's typical of RCA: solid, musical, and free from excessive coloration.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHighs:\u003c\/strong\u003e Clean and well-integrated. The highs are smooth and controlled, without harshness, with consistent detail that never becomes fatiguing.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDynamics:\u003c\/strong\u003e Smooth and fluid. The response is prompt but composed, with predictable and stable behavior, ideal for line stages and drivers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSoundstage:\u003c\/strong\u003e Stable and well-organized soundstage. Good separation of sound planes and correct imaging, with an orderly and realistic presentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1924\" data-start=\"1884\"\u003e🎧 \u003cstrong\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1906\" data-end=\"1917\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1920\" data-end=\"1955\"\u003epreamplifiers and line stages in non-critical positions\u003c\/li\u003e\n\u003cli data-start=\"1958\" data-end=\"1994\"\u003edrivers and buffers\u003c\/li\u003e\n\u003cli data-start=\"1997\" data-end=\"2065\"\u003eVintage and modern hi-fi amplifiers compatible with 12AU7 \/ 5963\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2067\" data-end=\"2232\"\u003eParticularly suitable for non-critical or moderate gain positions, where operational stability, low overall noise and timbral coherence are required.\u003c\/p\u003e\n\u003cp data-end=\"2293\" data-start=\"2243\"\u003e🎸 \u003cstrong\u003eUse in Musical Instrument Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2276\" data-end=\"2287\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2290\" data-end=\"2345\"\u003eGuitar and bass amplifiers in driver, phase inverter or V2\/V3 positions\u003c\/li\u003e\n\u003cli data-start=\"2348\" data-end=\"2384\"\u003eapplications where operational stability, good control and low background noise are required\u003c\/li\u003e\n\u003cli data-start=\"2387\" data-end=\"2436\"\u003euse in studios or in professional settings where low overall noise is an important requirement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2438\" data-end=\"2672\"\u003eIt offers reliable, controlled operation, with low noise and predictable response.\u003cbr data-start=\"2531\" data-end=\"2534\"\u003eIt is recommended to avoid using them in the most sensitive or very high-gain positions; however, they are perfectly suited to less critical stages, where they can offer reliable and consistent operation.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-end=\"2601\" data-start=\"2566\"\u003e🎯 \u003cstrong\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eA solid and coherent pair, designed for those looking for reliability, musicality and the classic RCA character of the 50s, without compromising on operational stability.\u003cbr\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/p\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 Va = 250V ; Vg = -8.5V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 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\u003cdiv\u003e\u003cstrong\u003eValve #8:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSection 1: Gm = 2300 ; Ia = 11.4 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSection 2: Gm = 2300 ; Ia = 11.0 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eValve #9:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSection 1: Gm = 2400 ; Ia = 12.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSection 2: Gm = 2200 ; Ia = 11.0 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\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\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Standard. Tested and approved for use in hi-fi and guitar amplifiers. Recommended for use in V2, V3, V4, as a driver, or in less critical stages. Not recommended in V1 or in very high-gain positions that are particularly sensitive to microphonics.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections present a coherent overall balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage - Tested and working - Comes in our custom box for optimal protection.\u003cbr\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cbr\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.\u003cbr\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e56-39 → RMA\/EIA Open Date Code → manufactured week 39 of 1956\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\"\u003eFind out why our valves are different →\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":56431995191644,"sku":"03351","price":98.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_24592fb0-a2e5-4d2f-9a59-1c5f306ea3e7.jpg?v=1768063417","url":"https:\/\/vacuumtubestreasures.com\/en-us\/products\/5963-12au7-rca-matched-pair-long-black-plates-foil-getter-amplitrex-tested-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}