{"product_id":"jrc-12au7-ecc82-rca-long-black-plates-square-getter-amplitrex-tested-tube","title":"JRC 12AU7 ( ECC82 ) RCA Long Black Plates Square Getter AMPLITREX Tested Tube","description":"\u003ch3\u003e\u003cstrong\u003eJRC 12AU7 (ECC82) RCA Long Black Plates Square Getter AMPLITREX Tested Tube @Like NOS Made in USA '50s\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – STRONG – Low Noise \u0026amp; Microphonics – Vintage American Raytheon Production\u003c\/strong\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eTest Results:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -8.5V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Average:\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\u003cp\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2100; Ia = 11.0 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2000; Ia = 9.6 mA\u003c\/li\u003e\n\u003c\/ul\u003e\u003chr\u003e\u003ch3\u003eDescription:\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003e12AU7 (ECC82) RCA\u003c\/strong\u003e, in this \u003cstrong\u003eLong Black Plates\u003c\/strong\u003e version with a \u003cstrong\u003esquare getter\u003c\/strong\u003e, is one of the most musical and refined configurations among early American productions. The \u003cstrong\u003eJRC\u003c\/strong\u003e brand imprinted on the bulb identifies a production for \u003cstrong\u003emilitary or governmental supplies\u003c\/strong\u003e, with higher selection and quality standards compared to commercial versions.\u003c\/p\u003e\u003cp\u003eThis tube, \u003cstrong\u003eAmplitrex tested with new values\u003c\/strong\u003e, combines \u003cstrong\u003econstruction robustness\u003c\/strong\u003e, a \u003cstrong\u003efull and natural voice\u003c\/strong\u003e, and \u003cstrong\u003egreat dynamic coherence\u003c\/strong\u003e, making it ideal for demanding hi-fi systems and high-level professional applications.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBass:\u003c\/strong\u003e deep, extended, and well-controlled. The low range is solid, with precise articulation and good depth. It shows no bloating or emphasis, but a well-balanced harmonic support.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMids:\u003c\/strong\u003e warm, rich, and three-dimensional. Vocals have body and presence, with a velvety yet always intelligible rendition. Acoustic instruments maintain natural timbre, with sweet harmonics and a wide sound structure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighs:\u003c\/strong\u003e refined, delicate, and never intrusive. The high range is present with elegance, without sibilance or harshness. Details are heard with fluidity, contributing to an extended and relaxed listening experience.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDynamics:\u003c\/strong\u003e progressive and well-controlled. The tube responds with balance to signal variations, both in micro-contrasts and in managing wider excursions. The overall behavior is natural, coherent, and musical.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoundstage:\u003c\/strong\u003e wide, deep, and believable. The stereo image is well-centered, with a stable, fluid, and rich soundstage of environmental information. The symmetrical construction and low background noise contribute to a realistic spatial presentation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThe \u003cstrong\u003e12AU7 RCA JRC Long Black Plates – Made in USA, 1950s\u003c\/strong\u003e, is a reference tube for those seeking a \u003cstrong\u003efull voice, transparency, reliability, and timbral coherence\u003c\/strong\u003e, with the guarantee of a military selection standard.\u003c\/p\u003e\u003ch3\u003e🎧 \u003cstrong\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\n\u003c\/h3\u003e\u003cp\u003eThis tube is particularly suitable for \u003cstrong\u003etube preamplifiers\u003c\/strong\u003e, \u003cstrong\u003edriver stages\u003c\/strong\u003e, \u003cstrong\u003etube DACs\u003c\/strong\u003e, and \u003cstrong\u003eheadphone amplifiers\u003c\/strong\u003e that require a \u003cstrong\u003efull-bodied, natural, and three-dimensional sound\u003c\/strong\u003e. In \u003cstrong\u003eSRPP\u003c\/strong\u003e, \u003cstrong\u003emu-follower\u003c\/strong\u003e, or \u003cstrong\u003esingle-ended\u003c\/strong\u003e configurations, it delivers a \u003cstrong\u003edeep, fluid, and transparent presentation\u003c\/strong\u003e, ideal for listening with reference headphones such as \u003cstrong\u003eSennheiser HD650\u003c\/strong\u003e, \u003cstrong\u003eZMF Verité\u003c\/strong\u003e, \u003cstrong\u003eFocal Clear\u003c\/strong\u003e, or \u003cstrong\u003eAudeze LCD-X\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003e🎸 \u003cstrong\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003e12AU7 RCA JRC\u003c\/strong\u003e also performs excellently in musical contexts, especially as an \u003cstrong\u003eoutput tube in preamplifiers\u003c\/strong\u003e, or in secondary roles within tube guitar or bass amplifiers. Its \u003cstrong\u003esoft, authoritative, and controlled timbral behavior\u003c\/strong\u003e allows for \u003cstrong\u003eprogressive saturation\u003c\/strong\u003e, useful for achieving a \u003cstrong\u003ewarm, defined, and never harsh sound\u003c\/strong\u003e, with particular effectiveness on string instruments and complex timbres.\u003c\/p\u003e\u003ch3\u003e🎯 \u003cstrong\u003eNote for audiophiles:\u003c\/strong\u003e\n\u003c\/h3\u003e\u003cp\u003eA \u003cstrong\u003etimeless\u003c\/strong\u003e tube, built to last and play with \u003cstrong\u003estability, harmony, and naturalness\u003c\/strong\u003e. This \u003cstrong\u003emilitary JRC\u003c\/strong\u003e version represents an excellent choice for those who want to maintain \u003cstrong\u003etimbral coherence\u003c\/strong\u003e, a \u003cstrong\u003efull voice\u003c\/strong\u003e, and \u003cstrong\u003eno listening fatigue\u003c\/strong\u003e, with the guarantee of the best vintage RCA production.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eAdditional Tests Performed:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and compliant for use in hi-fi and guitar amplifiers.\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\u003chr\u003e\u003ch3\u003eCondition:\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully operational.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Adequate – Markings partially faded or hard to read, overall aesthetics with clear signs of age. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e -\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cspan class=\"s2\"\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\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":58783985238364,"sku":"02926","price":99000.0,"currency_code":"KRW","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/s-l1600_a4884fa7-6252-44be-be9f-77135bbfc2c8.webp?v=1787590082","url":"https:\/\/vacuumtubestreasures.com\/en-kr\/products\/jrc-12au7-ecc82-rca-long-black-plates-square-getter-amplitrex-tested-tube","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}