{"product_id":"jan-12au7-ecc82-tung-sol-black-plates-amplitrex-tested-d-getter-made-in-usa-50s","title":"JAN 12AU7 \/ ECC82 TUNG-SOL Black Plates D Getter Balanced Tube Made in USA '50s","description":"\u003ch3\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eJAN 12AU7 \/ ECC82 TUNG-SOL Black Plates D Getter Made in USA '50s\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e– Low Noise \u0026amp; Microphonics –\u003cspan\u003e VERY STRONG \u003cmeta charset=\"utf-8\"\u003e– Balanced \u003cmeta charset=\"utf-8\"\u003e–  Vintage TUNG-SOL Production\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -8.5V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2300 ; Ia = 12.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2300 ; Ia = \u003cmeta charset=\"utf-8\"\u003e12.2 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eNoise: \u003c\/strong\u003eLow and well controlled. Quiet operation in hi-fi and musical amplifiers in the designated positions.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Excellent - The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePrecious \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJAN 12AU7 \/ ECC82 of authentic TUNG-SOL US production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, attributable approximately to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1950s\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e based on construction characteristics. The configuration with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eblack plates and D-getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e belongs to the most sought-after vintage American production and is offered here in the robust \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJAN\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e military version, particularly interesting for hi-fi equipment and quality tube amplifiers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAccurately tested with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAMPLITREX AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, it recorded identical values on both sections: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 2300 \/ 2300\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eIa 12.2 \/ 12.2 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Compared to the reference values for the 12AU7, these measurements confirm \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e emission, superior to the nominal value, along with virtually \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eperfect balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. This exceptional symmetry makes the tube particularly suitable as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ephase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, as well as a driver or in the line stages of hi-fi systems and guitar amplifiers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48-hour burn-in\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e confirmed stable operation without fluctuations. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection ensures low and well-controlled noise, allowing its use even in the most sensitive audio stages. \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShorts and gas are absent.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSonically, American TUNG-SOL tubes of this generation are generally appreciated for a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edynamic, full-bodied, and natural\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e presentation, with a present and musical midrange, solid and well-articulated bass, and clean, defined but never unnecessarily aggressive highs. A tube capable of offering \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eenergy, balance, and excellent intelligibility\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while preserving the authentic character of the best vintage USA production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA valuable \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJAN 12AU7 \/ ECC82 TUNG-SOL Black Plates D Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, truly tested and selected by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e emission, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexceptional balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, and full operational stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVintage - Tested and working - Supplied in our custom box for optimal protection. \u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e\u003cspan\u003e Sufficient – Markings almost completely faded. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cspan\u003e Code not decipherable. Production roughly attributable to the 1950s based on construction characteristics.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\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":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":59086173110620,"sku":"03804V","price":457.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/8_5bbcb3ec-71a5-4594-b02f-b1201e92f382.jpg?v=1789143674","url":"https:\/\/vacuumtubestreasures.com\/en-dk\/products\/jan-12au7-ecc82-tung-sol-black-plates-amplitrex-tested-d-getter-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}