{"product_id":"12au7-ecc82-tung-sol-black-plates-amplitrex-matched-pair-d-getter-made-in-usa-50s","title":"JAN 12AU7 \/ ECC82 TUNG-SOL Black Plates AMPLITREX Matched Pair D Getter Made in USA '50s","description":"\u003ch3\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eJAN 12AU7 \/ ECC82 TUNG-SOL Black Plates Matched Pair 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 - 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\u003eAverage 100%:\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 #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 10.4 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 1900 ; Ia = 9.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 1900 ; Ia = 10.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 1900 ; Ia = 9.4 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. Silent operation in hi-fi and musical amplifiers in the intended positions.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. 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 selected pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJAN 12AU7 \/ ECC82 of authentic TUNG-SOL US production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, dating back approximately to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1950s\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e by construction. The characteristic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eblack plates and D-getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identify one of the most appreciated American configurations of the era, offered here in military \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJAN\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e version and as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Pair\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The silk-screening is almost completely gone, but the internal construction retains all the charm and substance of the best vintage US production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth tubes have undergone full measurements with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAMPLITREX AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, recording very consistent values: Gm between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1900 and 2000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and anode currents between \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e9.4 and 10.4 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ematching between the two specimens is excellent\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while the internal sections are well-aligned and correctly balanced. The pair is therefore also suitable for use 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 equipment 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 \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003estrong, stable, and fluctuation-free emission\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection also ensures quiet and controlled operation, suitable even for 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\u003eFrom a sonic perspective, American TUNG-SOL tubes of this generation are generally sought after for an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eenergetic and natural\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e presentation, with a present mid-range, solid and well-articulated bass, and a clean, defined, but never unnecessarily aggressive high-end. A musical and authoritative performance, capable of combining \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebody, dynamics, and good transparency\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA precious pair of \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, matched, 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\u003elow noise\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003estability\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexcellent balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\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\u003eAesthetic condition:\u003c\/strong\u003e\u003cspan\u003e Fair – 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 Indecipherable code. Production attributed approximately 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=\"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\"\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":59085184663900,"sku":"03803V","price":99.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/11_f517cdc3-a09a-4925-b5eb-e7e31c97b5c4.jpg?v=1789139244","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12au7-ecc82-tung-sol-black-plates-amplitrex-matched-pair-d-getter-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}