{"product_id":"12au7-ecc82-baldwin-by-rca-amplitrex-matched-quad-clear-top-long-gray-plates-side-d-getter-tubes","title":"12AU7 \/ ECC82 Baldwin by RCA AMPLITREX Matched Quad Clear Top Long Gray Plates Side D Getter Tubes","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7 \/ ECC82 Baldwin by RCA Matched Quad – Clear Top – Long Gray Plates – Side D Getter – Made in USA ’59\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex Tested – VERY STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eGeneral Description:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad of 12AU7 \/ ECC82 Baldwin by RCA – Made in USA, circa 1959\u003c\/b\u003e\u003c\/span\u003e represents one of the most interesting configurations of late 1950s American production.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eTubes branded \u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e were often produced by RCA for organ applications, following high-quality standards and a selection focused on stability and consistency over time.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe constructive configuration is particularly distinctive:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eClear Top\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSide D Getter\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eClear Top\u003c\/b\u003e\u003c\/span\u003e design, typical of some RCA productions, promotes more efficient dissipation and a more open and linear response, contributing to a clean and well-defined sound reproduction.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe quad comes from the \u003cspan class=\"s1\"\u003e\u003cb\u003esame manufacturing batch\u003c\/b\u003e\u003c\/span\u003e and has undergone careful selection using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, resulting in a \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad\u003c\/b\u003e\u003c\/span\u003e with extremely close values:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage Gm range of quad: 0.0%\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage Ia range of quad: 1.1%\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eAll tubes are rated \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e, with \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003estable emission\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e, \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003elow noise and microphonics\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e, and have \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003epassed the burning test\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003eThis Baldwin by RCA quad offers an \u003cspan class=\"s1\"\u003e\u003cb\u003ebalanced, transparent, and highly consistent\u003c\/b\u003e\u003c\/span\u003e sound signature, with a presentation that emphasizes precision, naturalness, and control.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe Clear Top construction, combined with the long plates, delivers a clean and articulated sound, with a remarkable ability to maintain order and definition even in the most complex passages.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eFast and well-controlled, with excellent articulation.\u003cbr\u003eNot intrusive, but always present and functional to the structure of the sound message.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eLinear and very legible.\u003cbr\u003eVocals emerge with clarity, maintaining a natural reproduction free from excessive coloration.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eOpen and clean, with good extension.\u003cbr\u003eNever aggressive, they contribute to an overall sense of air and transparency.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eResponsive and precise, with very controlled transient management.\u003cbr\u003eExcellent in both micro and macro dynamics.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eOrderly and well-focused, with clear instrument separation and a stable soundstage.\u003c\/p\u003e\n\u003ch3 data-start=\"1884\" data-end=\"1924\"\u003e🎧 \u003cstrong\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis quad is perfectly suited for high-level hi-fi applications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eline preamplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003ephono stages\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003edrivers and buffers\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eThe combination of \u003cspan class=\"s1\"\u003e\u003cb\u003eprofessional matching\u003c\/b\u003e\u003c\/span\u003e, low noise, and operational stability makes it ideal for systems where consistency and quietness are essential.\u003c\/p\u003e\n\u003ch3 data-start=\"2243\" data-end=\"2293\"\u003e🎸 \u003cstrong\u003eUse in Musical Instrument Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn musical applications, it offers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003every controlled response\u003c\/li\u003e\n\u003cli\u003eexcellent definition even in high-gain contexts\u003c\/li\u003e\n\u003cli\u003epredictable and consistent behavior among tubes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eParticularly suitable for configurations where uniformity between multiple stages is required.\u003c\/p\u003e\n\u003ch3 data-start=\"2566\" data-end=\"2601\"\u003e🎯 \u003cstrong\u003eNote for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin by RCA – Made in USA (circa 1959)\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eClear Top – Long Gray Plates – Side D Getter\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSame manufacturing batch\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTrue Matched Quad\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eVTT Classification: VERY STRONG\u003c\/b\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eThis quad represents a \u003cspan class=\"s1\"\u003e\u003cb\u003ehigh-level solution\u003c\/b\u003e\u003c\/span\u003e, designed for those who desire a truly coherent set, carefully selected and ready to be integrated into demanding systems.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIt is not just a simple set of tubes, but a \u003cspan class=\"s1\"\u003e\u003cb\u003equad built and verified to work together\u003c\/b\u003e\u003c\/span\u003e, offering stability, precision, and reliable sound reproduction over time.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eA selection that fully expresses the value of American RCA production, in the true style of Vacuum Tubes Treasures.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V ; Vg = -8.5V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #15:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 2000 ; Ia = 9.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e Section 2: Gm = 2100 ; Ia = 9.8 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #17:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 2000 ; Ia = 9.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e Section 2: Gm = 2100 ; Ia = 9.8 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #19:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 2100 ; Ia = 9.6 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e Section 2: Gm = 2000 ; Ia = 9.2 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #20:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 2000 ; Ia = 9.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Section 2: Gm = 2100 ; Ia = 9.6 mA\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\n\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and compliant for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBalance:\u003c\/strong\u003e Sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage - Tested and functional - Supplied in our custom box for optimal protection. \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Perfectly operational.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e Sufficient – Markings almost completely faded. See photos for details.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e59-26 274 → RMA\/EIA Open Date Code → manufactured the 26th week of 1959 - 274 → Radio Corporation of America, Camden, N. J.\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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" rel=\"noopener\" target=\"_blank\"\u003eDiscover why our tubes are different →\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":57389925892444,"sku":"03540","price":159.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_362bbdc7-cca0-4649-85d2-fb795d98286c.jpg?v=1776528360","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12au7-ecc82-baldwin-by-rca-amplitrex-matched-quad-clear-top-long-gray-plates-side-d-getter-tubes","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}