{"product_id":"12au7a-ecc82-nos-baldwin-by-raytheon-matched-quad-tubes-long-black-plates-halo-getter-made-in-usa-61","title":"12AU7A \/ ECC82 NOS Baldwin by RAYTHEON Matched Quad Tubes Long Black Plates Halo Getter Made in USA '61","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82 NOS BALDWIN by RAYTHEON – Long Black Plates – Halo Getter – Matched Quad – Made in USA – 1961\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage American Raytheon Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3 class=\"p2\"\u003e\u003cb\u003eDescription:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003ePrecious \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad\u003c\/b\u003e\u003c\/span\u003e of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82 NOS Baldwin tubes produced by Raytheon in the United States\u003c\/b\u003e\u003c\/span\u003e, dating approximately to the early 1960s. The sought-after \u003cspan class=\"s1\"\u003e\u003cb\u003eLong Black Plates\u003c\/b\u003e\u003c\/span\u003e construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e identifies one of Raytheon's best productions of the era, which is increasingly difficult to find in authentic NOS condition, especially in a matched quad configuration.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eBaldwin-branded tubes were intended for high-quality professional equipment, where reliability, long life, and quiet operation were fundamental requirements. Behind the Baldwin brand, therefore, lies excellent American Raytheon production, highly appreciated by audiophiles for its construction and sound qualities.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe quad has been carefully tested and selected in our laboratory using the \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e, achieving a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e classification. All tubes were found to have \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e and exhibit excellent electrical balance, a fundamental characteristic for amplifiers and preamplifiers that require a \u003cspan class=\"s1\"\u003e\u003cb\u003eperfectly matched quad\u003c\/b\u003e\u003c\/span\u003e to ensure consistent performance and maximum sonic uniformity.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSonically, Raytheon Long Black Plate tubes are known for their authoritative and refined reproduction, with deep and well-controlled bass, a rich and natural midrange, open yet always smooth high frequencies, and a wide, stable, and three-dimensional soundstage. They offer engaging musicality and remarkable transparency while retaining the typical warmth of the best American tubes of the period.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIdeal for push-pull amplifiers, reference preamplifiers, driver stages, phase splitters, headphone amplifiers, and all equipment compatible with \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82\u003c\/b\u003e\u003c\/span\u003e that requires a high-quality \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tubes are \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS (New Old Stock)\u003c\/b\u003e\u003c\/span\u003e, carefully tested, and perfectly functional. Cosmetic conditions are \u003cspan class=\"s1\"\u003e\u003cb\u003egood\u003c\/b\u003e\u003c\/span\u003e, with partially eroded but still legible silkscreens, with no effect on electrical performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eA rare \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad\u003c\/b\u003e\u003c\/span\u003e of authentic \u003cspan class=\"s1\"\u003e\u003cb\u003eRaytheon Long Black Plates\u003c\/b\u003e\u003c\/span\u003e, truly tested and selected by \u003cspan class=\"s1\"\u003e\u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e\u003c\/span\u003e, ideal for those who desire one of the most appreciated American 12AU7s ever produced in the most difficult configuration to find.\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\u003cspan\u003e \u003c\/span\u003eVERY STRONG\u003c\/p\u003e\n\u003cdiv\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eTube #26:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.4 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.0 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eTube #12:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2060 ; Ia = 9.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.4 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eTube #29:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2080 ; Ia = 9.4 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cdiv\u003e\u003cstrong\u003eTube #16:\u003c\/strong\u003e\u003c\/div\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.4 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2100 ; Ia = 9.8 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\n\u003c\/div\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\u003cb\u003eBurning Test:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e 48h – OK\u003c\/span\u003e\n\n\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\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eCondition\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 NOS – New Old Stock – tested and 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 Perfectly operational.\u003c\/li\u003e\n\n\u003cli class=\"p3\"\u003e\n\n\u003cb\u003eCosmetic condition:\u003c\/b\u003e Good – Partially eroded lettering, 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: P\u003c\/b\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e28061-17C\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e → \u003cstrong\u003e280\u003c\/strong\u003e → Raytheon Manufacturing Company, Waltham 54, Mass. ; \u003cstrong\u003e61-17\u003c\/strong\u003e → RMA\/EIA Open Date Code → manufactured in the 17th week of \u003cstrong\u003e1961\u003c\/strong\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan class=\"s2\"\u003e\u003cmeta charset=\"utf-8\"\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\/span\u003e\u003c\/p\u003e","brand":"RAYTHEON","offers":[{"title":"Default Title","offer_id":58434461925724,"sku":"03735U","price":249.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_1bd2b8b3-0186-459e-a09e-4891adcc1bc2.jpg?v=1785166487","url":"https:\/\/vacuumtubestreasures.com\/en-au\/products\/12au7a-ecc82-nos-baldwin-by-raytheon-matched-quad-tubes-long-black-plates-halo-getter-made-in-usa-61","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}