{"product_id":"6sn7gtb-nos-nib-sylvertone-by-sylvania-chrome-top-tested-tube-black-plates-usa","title":"6SN7GTB NOS NIB Silvertone by SYLVANIA CHROME TOP Tested Tube Black Plates USA","description":"\u003ch3 class=\"p1\"\u003e\u003cb\u003e6SN7GTB Silvertone by SYLVANIA – NOS NIB – Chrome Top – Black Plates – Made in USA\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Balanced Sections – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3 class=\"p1\"\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eSingle \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTB Silvertone by Sylvania\u003c\/b\u003e\u003c\/span\u003e tube, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA\u003c\/b\u003e\u003c\/span\u003e production, in \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS NIB – New Old Stock, New In Box\u003c\/b\u003e\u003c\/span\u003e condition, selected for compatible hi-fi and musical applications requiring stability, low noise, and authentic vintage Sylvania sound character.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe construction features \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e, a robust internal structure, and the classic \u003cspan class=\"s1\"\u003e\u003cb\u003eChrome Top\u003c\/b\u003e\u003c\/span\u003e, a distinctive element of American Sylvania production of that era. The \u003cspan class=\"s1\"\u003e\u003cb\u003eSilvertone\u003c\/b\u003e\u003c\/span\u003e brand identifies a supply manufactured by Sylvania for Sears\/Silvertone, maintaining the typical manufacturing quality of the original American production.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tube comes in its \u003cspan class=\"s1\"\u003e\u003cb\u003eoriginal box\u003c\/b\u003e\u003c\/span\u003e, with aesthetic conditions as shown in the photos. See images for all details.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIt has been tested on an \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e with a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, showing perfectly balanced sections in transconductance and very consistent anode current. It has also been selected as \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e, making it suitable for sensitive audio applications and compatible instrument amplifiers.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSonically, it offers a full, stable, and musically balanced performance, with controlled bass, natural mids, clear highs, and an organized soundstage. The character is typical of vintage American Sylvania production: solid, fluid, defined, and very reliable.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSuitable for preamplifiers, driver stages, phase splitters, integrated amplifiers, hi-fi circuits, and instrument amplifiers compatible with \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7 \/ 6SN7GTB\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eA \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTB Silvertone by Sylvania NOS NIB\u003c\/b\u003e\u003c\/span\u003e genuinely tested by Vacuum Tubes Treasures, ideal for those seeking a strong, quiet, balanced vintage American tube, preserved in its original box.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp data-end=\"3436\" data-start=\"3046\"\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003eAmplitrex AT-1000\u003c\/strong\u003e Tube tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -8V\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%\u003c\/strong\u003e \u003cstrong\u003eGm = 2600 ; Ia = 9.0 mA\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2600 ; Ia = 9.2 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2600 ; Ia = 8.4 mA\u003c\/li\u003e\n\n\n\u003c\/ul\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\u003eLow. Tested and compliant for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\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 Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and functional - Supplied in original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e Excellent – Markings well preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003enot decipherable, identifiable by construction characteristics. Late 1950s early 1960s\u003cmeta charset=\"utf-8\"\u003e\n\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" 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\/p\u003e","brand":"SILVERTONE","offers":[{"title":"Default Title","offer_id":58165508014428,"sku":"03698","price":1731.0,"currency_code":"CZK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_5092bee8-b0c5-4b77-881b-d6ee28e3ebe1.jpg?v=1782835612","url":"https:\/\/vacuumtubestreasures.com\/en-cz\/products\/6sn7gtb-nos-nib-sylvertone-by-sylvania-chrome-top-tested-tube-black-plates-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}