{"product_id":"6sn7-gtb-rca-silver-logo-amplitrex-tested-pair-same-data-codes-black-plates-d-getter-low-noise-mic-tubes","title":"6SN7 GTB RCA Silver Logo AMPLITREX Tested Pair Same Data Codes Black Plates D Getter Low Noise \u0026 Mic Tubes","description":"\u003ch3 class=\"p1\"\u003e\u003cstrong\u003e6SN7 GTB RCA Silver Logo AMPLITREX Tested Pair Same data Codes Black Plates D Getter - Made In USA - 1960\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – 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 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 = 2430 ; Ia = 8.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2: \u003c\/strong\u003eGm = 2480 ; Ia = 8.2 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 = 2200 ; Ia = 8.4 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2: \u003c\/strong\u003eGm = 2000 ; Ia = 7.6 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\u003eA prized pair of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6SN7GTB RCA Silver Logo\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes, manufactured in the United States in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1960\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and featuring the classic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBlack Plates with D Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction. Both tubes bear the same manufacturing code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLS\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, a particularly interesting detail for those seeking a matched pair in terms of period and production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis configuration belongs to the historic RCA American production of the early 1960s, highly regarded for its robust construction, reliability, and sound quality. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eBlack Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e paired with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eD Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e represent one of the most recognizable and sought-after constructions in the RCA 6SN7 family.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tubes have been thoroughly 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\u003eSTRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e classification. Both tested \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with consistent emission and internal sections sufficiently balanced for use in high-quality audio applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSonically, RCA Black Plate tubes are known for their full and natural reproduction, with solid and controlled bass, rich and present mids, smooth yet defined highs, and a wide and stable soundstage. The overall character is musical, full-bodied, and refined, typical of the best vintage RCA productions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIdeal for hi-fi preamplifiers, driver stages, phase splitters, headphone amplifiers, and equipment compatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6SN7GT \/ 6SN7GTB\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tubes are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eused\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, thoroughly 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 faded but still legible silk-screening and normal signs of age.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAn interesting pair of authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eRCA 6SN7GTB Black Plates from 1960\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, truly tested and selected by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\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 Good. The sections show consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEmission:\u003c\/b\u003e\u003c\/span\u003e Strong – Strong and consistent emission, suitable for any application.\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\u003eCosmetic condition:\u003c\/b\u003e\u003c\/span\u003e Good – Partially faded, but still legible lettering. Tube body in good condition. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing code:\u003c\/strong\u003e LS → two-letter code → March 1960 production → Radio Corporation of America, Camden, N. J.\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":58795354849628,"sku":"03754","price":1352.0,"currency_code":"SEK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_603fdeb9-24ff-49a0-971a-d4a641ae0943.jpg?v=1787656501","url":"https:\/\/vacuumtubestreasures.com\/en-se\/products\/6sn7-gtb-rca-silver-logo-amplitrex-tested-pair-same-data-codes-black-plates-d-getter-low-noise-mic-tubes","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}