{"product_id":"12au7a-ecc82-nos-rca-matched-pair-tubes-long-gray-plates-halo-getter-usa","title":"12AU7A \/ ECC82 NOS RCA Matched Pair Tubes - Long Gray Plates Halo Getter USA","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82 NOS RCA Matched Pair Long Gray Plates Halo Getter Made in USA\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage American RCA Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis matched pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82 RCA NOS\u003c\/b\u003e\u003c\/span\u003e, Made in USA production, represents a particularly interesting selection for enthusiasts of the best vintage American tubes.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eAlthough branded RCA, the internal construction is clearly traceable to \u003cspan class=\"s1\"\u003e\u003cb\u003eSYLVANIA USA\u003c\/b\u003e\u003c\/span\u003e production, recognizable by the typical structure with \u003cspan class=\"s1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e, a configuration much appreciated for reliability, quiet operation, and balanced musicality.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tubes are in \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS (New Old Stock)\u003c\/b\u003e\u003c\/span\u003e condition and have been carefully selected and matched in our laboratory using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e, both testing \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e, with excellent electrical consistency and good balance between sections.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection makes them particularly interesting for quality hi-fi applications, including preamplifiers, line stages, and sensitive circuits.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eAesthetically, the pair is in \u003cspan class=\"s1\"\u003e\u003cb\u003every good condition\u003c\/b\u003e\u003c\/span\u003e, with legible lettering and normal signs of age consistent with long-term storage. See photos for details.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThe best Sylvania Long Gray Plates productions are appreciated for their tonal balance, natural midrange, and ability to deliver an engaging yet controlled musical reproduction.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"s1\"\u003eBass\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe low end is well-articulated and controlled, with a pleasant sense of solidity and presence without excess.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMidrange\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe midrange is one of the strengths of this production. Vocals are natural, well-focused, and rich in harmonic nuances, while acoustic instruments maintain remarkable timbral credibility.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe highs are open, clean, and well-extended, with a refined presentation that avoids any sense of aggressiveness.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDynamic response is prompt and natural, with a good ability to follow musical variations and preserve the sense of rhythm.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe soundstage is wide and stable, with correct instrument placement and a pleasant sense of depth.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThis pair is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eTube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eLine stages\u003c\/li\u003e\n\n\u003cli\u003eDriver stages\u003c\/li\u003e\n\n\u003cli\u003eIntegrated amplifiers\u003c\/li\u003e\n\n\u003cli\u003eDACs and tube buffers\u003c\/li\u003e\n\n\u003cli\u003eRestoration of vintage hi-fi electronics\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection also makes them suitable for the most sensitive positions in the circuit.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eIn amplifiers for musical instruments and compatible professional equipment, these 12AU7A can offer:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eExcellent operational stability\u003c\/li\u003e\n\n\u003cli\u003eNatural harmonic response\u003c\/li\u003e\n\n\u003cli\u003eLow noise\u003c\/li\u003e\n\n\u003cli\u003eExcellent signal intelligibility\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eFeatures that make them interesting for both studio and live applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for Audiophiles and Technicians\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThis pair combines several elements particularly appreciated by enthusiasts:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eGolden age American production\u003c\/li\u003e\n\n\u003cli\u003eRCA brand\u003c\/li\u003e\n\n\u003cli\u003eSylvania USA construction\u003c\/li\u003e\n\n\u003cli\u003eLong Gray Plates\u003c\/li\u003e\n\n\u003cli\u003eHalo Getter\u003c\/li\u003e\n\n\u003cli\u003eMatched Pair\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\u003cli\u003eVERY STRONG performance\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eA high-quality selection that offers the charm of the best vintage American production, with solid performance and great versatility of use.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTest Results:\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eTube Tester:\u003cbr\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8.5V\u003cbr\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 2100 ; Ia = 9.0 mA\u003cbr\u003eSection 2: Gm = 2000 ; Ia = 9.6 mA\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube #5:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSection 1: Gm = 2100 ; Ia = 9.0 mA\u003cbr\u003eSection 2: Gm = 2100 ; Ia = 8.8 mA\u003c\/p\u003e\n\u003ch3\u003eAdditional Tests Performed:\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eLow. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eBalance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThe 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\n\u003cli\u003e\n\n\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eExcellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAbsent.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. \u003c\/span\u003e\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Perfectly operational.\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e\u003cspan\u003e Very Good – Legible markings with slight signs of age. See photos for details.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e undecipherable, identifiable by construction characteristics. 1960s\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":57896091058524,"sku":"03645","price":59.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_0dae141e-f9b4-4ca0-9ff4-249296d06e57.jpg?v=1780999642","url":"https:\/\/vacuumtubestreasures.com\/en-mc\/products\/12au7a-ecc82-nos-rca-matched-pair-tubes-long-gray-plates-halo-getter-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}