{"product_id":"6sn7-gt-rca-radiotron-smoked-glass-matched-pair-silver-logo-black-plates-d-getter-amplitrex-tested-low-noise-tubes","title":"6SN7 GT RCA Radiotron Smoked Glass Matched Pair Silver Logo Black Plates D Getter AMPLITREX Tested Low Noise Tubes","description":"\u003ch3 class=\"p1\"\u003e\u003cstrong\u003e6SN7 GT RCA Radiotron Smoked Glass Matched Pair Silver Logo Black Plates D Getter - Made In USA - 1942\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003eAmplitrex AT-1000 Tube tester\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8V\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eAverage 100% Gm = 2600 ; Ia = 9.0 mA\u003c\/strong\u003e\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 class=\"p1\"\u003e\u003cb\u003eTube #1\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1: \u003c\/strong\u003eGm = 2700 ; Ia = 9.4 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2: \u003c\/strong\u003eGm = 2900 ; Ia = 9.2 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eTube #2\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1: \u003c\/strong\u003eGm = 2700 ; Ia = 7.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2: \u003c\/strong\u003eGm = 2900 ; Ia = 8.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eExtremely rare matched pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6SN7GT RCA Radiotron\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in the United States in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1942\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, belonging to the very first generation of the renowned 6SN7. The construction with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSmoked Glass\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSilver Logo\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBlack Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebottom D Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies a very early configuration, highly sought after by collectors and audiophiles today.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThese specimens fully represent the quality of RCA production from the early 1940s, with robust construction, selected materials, and internal geometry typical of the first American 6SN7s. The presence of smoked glass and the D getter also contributes to making this pair visually and historically very interesting.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe pair has been carefully tested and selected 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 classification. Both tubes were found to have \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and show good balance between sections, with stable and consistent electrical behavior.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSonically, the early RCA 6SN7GTs are appreciated for their authoritative, natural, and three-dimensional reproduction, with full and controlled bass, rich and textured mids, smooth but well-defined high frequencies, and a wide, deep, and very stable soundstage. The overall character is musical, fluid, and refined, with that combination of body, naturalness, and spaciousness typical of the best RCA productions of the era.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIdeal for hi-fi preamplifiers, driver stages, phase splitters, headphone amplifiers, and all equipment compatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6SN7GT\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e that requires a high-quality matched pair.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tubes are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVintage\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested, and fully functional. The aesthetic conditions are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexcellent\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with well-preserved lettering and minimal signs of aging.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA rare matched pair of authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRCA Radiotron 6SN7GT Smoked Glass from 1942\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 one of the most fascinating and musically appreciated American productions of the early 6SN7 era.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eAdditional Tests:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eMicrophonics and noise:\u003c\/b\u003e\u003c\/span\u003e Low. Tested and suitable for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBalance:\u003c\/b\u003e\u003c\/span\u003e Sections are consistent and well-matched, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEmission:\u003c\/b\u003e\u003c\/span\u003e Excellent – Very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cb\u003eShorts \/ Gas:\u003c\/b\u003e\u003cspan class=\"s1\"\u003e absent\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eCondition:\u003c\/b\u003e\u003c\/span\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eFunctionality:\u003c\/b\u003e\u003c\/span\u003e Fully operational\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eAesthetic condition:\u003c\/b\u003e\u003c\/span\u003e Excellent – Lettering is well-preserved, minimal signs of aging. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing code:\u003c\/strong\u003e RCA S3 and S5, traceable to 1942: May–June and September–October respectively. The vintage construction, with black plates, bottom D getter, and smoked glass, is fully consistent with this period.\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":"RCA","offers":[{"title":"Default Title","offer_id":58794945216860,"sku":"03753","price":159.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_58515691-2979-4e03-a6c2-b9023e26d9db.jpg?v=1787652612","url":"https:\/\/vacuumtubestreasures.com\/en-si\/products\/6sn7-gt-rca-radiotron-smoked-glass-matched-pair-silver-logo-black-plates-d-getter-amplitrex-tested-low-noise-tubes","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}