{"product_id":"6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-63","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\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eGeneral Description\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis matched 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, represents a very interesting selection of American Sylvania production intended for Baldwin supplies, a brand historically linked to musical and professional applications.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe tubes are used, but carefully tested, selected, and matched in our laboratory as a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Pair\u003c\/b\u003e\u003c\/span\u003e. The presence of the \u003cspan class=\"s1\"\u003e\u003cb\u003esame data codes\u003c\/b\u003e\u003c\/span\u003e on both tubes indicates lot consistency and greater manufacturing and aesthetic uniformity.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConstruction\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThe construction is typical of Sylvania production of the era:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eBlack Plates\u003c\/li\u003e\n\n\u003cli\u003eTop Halo Getter\u003c\/li\u003e\n\n\u003cli\u003eTop Getter Flashing\u003c\/li\u003e\n\n\u003cli\u003eBlack Base\u003c\/li\u003e\n\n\u003cli\u003eBaldwin green silkscreening still clearly legible\u003c\/li\u003e\n\n\u003cli\u003eSame Data Codes\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eGeneral aesthetic conditions are excellent, with minimal signs consistent with age and vintage use. See photos for details.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTesting, Matching, and Classification\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\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.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eIt has also been selected as \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e, making it particularly interesting for audio applications where stability, quietness, and channel consistency are important elements.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe real matching between the two tubes makes it suitable for hi-fi systems and compatible circuits that require a well-balanced and reliable 6SN7GTB pair.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis Baldwin by Sylvania pair offers a full, stable, and musically balanced sound signature, with the classic character of American Sylvania production.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe low range is solid and well-controlled, the mids are present and natural, while the highs remain clean, balanced, and well-integrated. The overall rendition is smooth, orderly, and pleasant, with good dynamics and a stable soundstage, favored by the matching between the two tubes and their origin from the same lot.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eRecommended Use\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eSuitable for compatible hi-fi applications, including:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003epreamplifiers\u003c\/li\u003e\n\n\u003cli\u003edriver stages\u003c\/li\u003e\n\n\u003cli\u003ephase splitters\u003c\/li\u003e\n\n\u003cli\u003eaudio circuits employing 6SN7 \/ 6SN7GTB tubes\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection also makes it suitable for sensitive applications, always subject to verification of the technical compatibility of the equipment and the circuit position in which it will be used.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eIn the musical field, it can offer a full, controlled, and dynamically stable response, with the solid and well-defined sound character typical of vintage Sylvania 6SN7GTB.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eVTT Note\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eA pair of vintage American 6SN7GTB tubes that are not generic, but genuinely selected, tested, and matched as a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Pair\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe combination of Sylvania Made in USA 1961 production, Baldwin selection, same data codes, black plates \/ halo getter construction, real testing on Amplitrex, and \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e classification makes it a solid choice for hi-fi systems and compatible musical applications.\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 #4:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2400 ; Ia = 7.2 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2300 ; Ia = 7.2 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #17:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2200 ; Ia = 6.8 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2400 ; Ia = 7.8 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 use in hi-fi, 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\u003eCosmetic 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\u003cmeta charset=\"utf-8\"\u003e\u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why Our Tubes Are Different – the VTT Protocol that Improves Sound, Reliability, and Durability\" rel=\"noopener\" 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":58128076702044,"sku":"03688","price":79.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_ee51fd9f-1efb-4cb0-930b-dc648fa4199f.jpg?v=1782204683","url":"https:\/\/vacuumtubestreasures.com\/en-pt\/products\/6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-63","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}