{"product_id":"6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-65","title":"6SN7GTB Baldwin by SYLVANIA Matched Pair Black Plates Tubes Same Codes Made in USA '61","description":"\u003ch3 class=\"p1\"\u003e\u003cb\u003e6SN7GTB Baldwin by SYLVANIA – Matched Pair – Same Data Codes – Made in USA 1961\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics – Vintage American Sylvania Production\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eMatched pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTB Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA 1961\u003c\/b\u003e\u003c\/span\u003e production, selected for compatible hi-fi and musical applications requiring stability, channel consistency, and low noise.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe tubes come from the same batch and feature \u003cspan class=\"s1\"\u003e\u003cb\u003esame data codes\u003c\/b\u003e\u003c\/span\u003e, an important detail for manufacturing and aesthetic uniformity. The construction is typical of Sylvania of the era, with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eupper halo getter\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003etop getter flashing\u003c\/b\u003e\u003c\/span\u003e, black base, and a still clearly legible green Baldwin silk-screen print. General aesthetic conditions are excellent, with minimal signs consistent with age and vintage use. See photos for details.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe pair has been tested on an \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e with a result of \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e and has been selected as \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e. The actual matching between the two tubes makes it a solid choice for systems where balance, quietness, and operational reliability are important elements.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eSonically, it offers a full, stable, and musically balanced performance, with controlled bass, natural mids, clean highs, and an organized soundstage. The character is typical of vintage American Sylvania production: solid, fluid, and well-defined.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eSuitable for preamplifiers, driver stages, phase splitters, and circuits compatible with \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7 \/ 6SN7GTB.\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eA truly selected, tested, and matched vintage American pair from Vacuum Tubes Treasures, ideal for those seeking reliable performance, low noise, and authentic Sylvania sound character.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/p\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 Va = 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\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #9:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2600 ; Ia = 9.0 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2400 ; Ia = 8.0 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #19:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2500 ; Ia = 8.6 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2500 ; Ia = 8.8 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\n\n\u003cstrong\u003eMicrophonics\u003c\/strong\u003e: Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\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 Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection. \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\u003eAesthetic condition:\u003c\/strong\u003e\u003cspan\u003e Excellent – Markings excellently preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 312 113 - 312 → Sylvania Electric Products Inc., Emporium, Pa. - 113 → 1 ( three digits ) → 1961 - 13 → 13th week of the year\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\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 noreferrer\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":58147383574876,"sku":"03693","price":79.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_87864d14-a502-47b9-9004-79e6f5df6df4.jpg?v=1782567206","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-65","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}