{"product_id":"6v6gt-nos-gm-by-raytheon-black-plates-smoked-glass-square-getter-matched-pair-tubes-usa-1957","title":"6V6GT NOS GM by Raytheon Black Plates Smoked Glass Square Getter Matched Pair Tubes USA 1957","description":"\u003ch3\u003e\u003cstrong\u003e6V6GT NOS GM by Raytheon Black Plates Smoked Glass Square Getter Tubes - Made in USA 1957\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eAMPLITREX Matched –\u003cspan\u003e VERY STRONG - Vintage American Raytheon 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 \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eVa = 250V; Vg2 = 250V; Vg = -12.5V \u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 4.1 ; Ia = 45 mA\u003c\/span\u003e\n\n\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\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 4.21 ; Ia = 42.6 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 3.90 ; Ia = 40.6 mA\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and confirmed for use in hi-fi equipment and guitar amplifiers.\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 None.\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\u003eSelected pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6V6GT NOS – New Old Stock\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, marketed under the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGM\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e brand and manufactured in the United States by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRaytheon Manufacturing Company\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e280 717\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies the Raytheon plant in Waltham, Massachusetts, and dates the production to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e17th week of 1957\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe construction is the most sought-after version of the American Raytheons from the fifties: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eblack plates, smoked glass, and square getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. A configuration of great historical charm, appreciated both by enthusiasts of vintage tube sound and by those looking for original components for vintage amplifiers and boutique builds.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe two tubes have been carefully selected and matched on an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Tube 1 recorded \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 4.21 mA\/V and Ia 42.6 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while Tube 2 measures \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 3.90 mA\/V and Ia 40.6 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The variance is contained within approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8% on transconductance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5% on anode current\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, confirming a solid and consistent match for use in 6V6GT-compatible push-pull output stages.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe transconductance values are respectively at approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e103% and 95% of the nominal reference\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, accompanied by strong and closely matched anode currents. Both tubes showed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every strong and stable emission\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, low microphonics, and a complete absence of gas, shorts, or fluctuations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn terms of sound, the fifties Raytheon black plates 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 rich and well-articulated mids, solid low frequencies, and a defined high range without excessive aggression. They are particularly interesting for vintage hi-fi amplifiers and guitar amplifiers where a musical, authoritative, and authentically American response is desired.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe pair is offered as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS – New Old Stock\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, tested and perfectly functional. The markings are very well preserved and the cosmetic condition is excellent, with only minimal signs due to age. Supplied in customized Vacuum Tubes Treasures boxes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA pair of 1957 Raytheons of great interest, selected for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eaccurate matching, very strong emission, and prestigious black plate construction with smoked glass and square getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eStatus:\u003c\/strong\u003e NOS - New Old Stock - Tested and functional - Supplied in our custom box for optimal protection. \u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Perfectly operational.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCosmetic Condition:\u003c\/strong\u003e Excellent – Markings well preserved, minimal signs of age. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 280 717 → 280 → Raytheon Manufacturing Company, Waltham 54, Mass. ; \u003cmeta charset=\"utf-8\"\u003e717 → RMA\/EIA Open Date Code → manufactured in the 17th week of 1957\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\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\/p\u003e","brand":"RAYTHEON","offers":[{"title":"Default Title","offer_id":59265577025884,"sku":"03838T","price":33000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_3d5de8f7-79bc-4d10-8716-d6d28820d198.jpg?v=1790244444","url":"https:\/\/vacuumtubestreasures.com\/en-jp\/products\/6v6gt-nos-gm-by-raytheon-black-plates-smoked-glass-square-getter-matched-pair-tubes-usa-1957","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}