{"product_id":"12au7a-ecc82-nos-baldwin-by-raytheon-matched-pair-tubes-long-black-plates-halo-getter-made-in-usa-61","title":"12AU7A \/ ECC82 NOS Baldwin by RAYTHEON Matched Pair 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 Pair – 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\"\u003ePrestigious matched pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7A \/ ECC82 NOS Baldwin tubes produced by Raytheon in the USA\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 time, now increasingly difficult to find in authentic NOS condition.\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 lies the excellent American Raytheon production, highly valued by audiophiles for its constructive and sonic qualities.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe pair 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. Both tubes were found to be \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e and exhibit excellent electrical balance, a characteristic that makes them particularly suitable for high-level audio applications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSonically, Raytheon Long Black Plate tubes are known for authoritative and refined reproduction, with deep and well-controlled bass, a rich and natural mid-range, open but always smooth high frequencies, and a wide, stable, and three-dimensional soundstage. They offer engaging musicality and remarkable transparency, while maintaining the typical warmth of the best American tubes of the period.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIdeal for hi-fi 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 matched pair.\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 fully functional. The aesthetic conditions are \u003cspan class=\"s1\"\u003e\u003cb\u003egood\u003c\/b\u003e\u003c\/span\u003e, with partially eroded but still legible screen printing, with no effect on electrical performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eA rare pair 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.\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\u0026nbsp;\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\u0026nbsp;\u003c\/span\u003eVa = 250V, Vg = -8.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u0026nbsp;\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\u0026nbsp;\u003c\/span\u003eVERY STRONG\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 8.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.4 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #8:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 2000 ; Ia = 9.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 2000 ; Ia = 8.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\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\u003cli class=\"p2\"\u003e\u003cb\u003eBurning Test:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eMicrophonics:\u003c\/b\u003e Low. Tested and suitable for hi-fi use even in phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\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\u003cli class=\"p3\"\u003e\u003cb\u003eEmission Quality:\u003c\/b\u003e Excellent – very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConditions\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eCondition:\u003c\/b\u003e NOS – New Old Stock – tested and functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eFunctionality:\u003c\/b\u003e Perfectly operational.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eAesthetic Condition:\u003c\/b\u003e Good – The lettering is partially eroded, but still legible. The valve body is in good condition. See photos for details.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\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 the 17th week of \u003cstrong\u003e1961\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\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":"RAYTHEON","offers":[{"title":"Default Title","offer_id":58389576417628,"sku":"03733U","price":589.0,"currency_code":"CNY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_8e84d321-17ef-4352-811a-c5fdebb93aa2.jpg?v=1784902530","url":"https:\/\/vacuumtubestreasures.com\/en-cn\/products\/12au7a-ecc82-nos-baldwin-by-raytheon-matched-pair-tubes-long-black-plates-halo-getter-made-in-usa-61","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}