{"product_id":"12au7-ecc82-dumont-by-tung-sol-gray-plates-horse-shoe-getter-amplitrex-tested","title":"12AU7 \/ ECC82 DUMONT by TUNG-SOL Gray Plates Horse Shoe Getter AMPLITREX Tested","description":"\u003ch3\u003e\u003cstrong\u003e12AU7 \/ ECC82 DUMONT by TUNG-SOL – Long Gray Plates – Horse Shoe Getter – Made in USA\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage American Tung-Sol Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Results\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003eTubes tested on\u003cspan\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eTest Conditions:\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Result:\u003c\/b\u003e\u003c\/span\u003e VERY STRONG\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2100 ; Ia = 9.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2060 ; Ia = \u003cmeta charset=\"utf-8\"\u003e9.5 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAdditional Tests Performed\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p2\"\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eMicrophonics:\u003c\/b\u003e Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eBalance:\u003c\/b\u003e The sections are consistent and well-aligned, making the tubes suitable for use as phase inverters in hi-fi and instrumental applications.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eEmission Quality:\u003c\/b\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\n\u003cli class=\"p2\"\u003e\n\n\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescription:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePrecious \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AU7 \/ ECC82 DUMONT produced by Tung-Sol in the United States in 1956\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, featuring the sought-after \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLong Gray Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHorse Shoe Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, typical of the best American productions of the mid-1950s.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDUMONT\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e branding identifies a selected OEM supply, while the manufacturing code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e322\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e clearly attributes production to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eTung-Sol Electric Inc.\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It is therefore an authentic vintage American Tung-Sol, interesting for both hi-fi enthusiasts and those seeking original components for quality vintage restorations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tube has been carefully subjected to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 hours of burn-in \/ stability test\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and subsequently tested in our laboratory using the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000 Tube Tester\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, achieving a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e rating. Both sections are well-balanced, and the tube has been selected for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with strong, stable, and anomaly-free emission.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSonically, Tung-Sol Long Gray Plate tubes from this period are appreciated for rich, natural, and dynamic reproduction, with full and well-controlled bass, a full-bodied and musical midrange, open but refined high frequencies, and a wide, deep, and well-focused soundstage. The overall character combines the typical warmth of 1950s American production with good transparency and definition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIdeal for hi-fi preamplifiers, compatible phono stages, driver stages, phase inverters, tube DACs, headphone amplifiers, and guitar amplifiers. Thanks to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection, it is also suitable for the most sensitive positions, including \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV1\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in compatible applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tube is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVintage\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested, and fully functional. The cosmetic condition is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003egood\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with partially eroded but still legible markings and the tube body in good overall condition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAn authentic and fascinating \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eDUMONT by Tung-Sol Long Gray Plates from 1956\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, genuinely tested and selected by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ideal for those seeking a strong, quiet, and musically refined vintage American 12AU7 \/ ECC82.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConditions\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eCondition:\u003c\/b\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eFunctionality:\u003c\/b\u003e Fully operational.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eCosmetic Condition:\u003c\/b\u003e Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.\u003c\/li\u003e\n\n\u003cli class=\"p2\"\u003e\n\n\u003cb\u003eManufacturing Code:\u003c\/b\u003e 322619-1 - 322 → Tung-Sol Electric Inc., Newark 4, N. J. - 619 → RMA\/EIA Open Date Code → manufactured in the 19th week of 1956\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\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":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":58842425622876,"sku":"03447","price":79.5,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/s-l1600_da45e0f5-623f-4f0e-8de6-65463a4b6e7f.webp?v=1787841946","url":"https:\/\/vacuumtubestreasures.com\/en-lv\/products\/12au7-ecc82-dumont-by-tung-sol-gray-plates-horse-shoe-getter-amplitrex-tested","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}