{"product_id":"6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-62","title":"6SN7GTB Baldwin by SYLVANIA Matched Pair Black Plates Tubes - Same Codes - Made in USA '61","description":"\u003ch3\u003e\u003cstrong\u003e\u003cspan class=\"s1\"\u003e6SN7GTB Baldwin by SYLVANIA – Matched Pair – Same Data Codes – Made in USA 1961\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"s1\"\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics - Vintage American Sylvania Production\u003c\/span\u003e\u003c\/strong\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=\"p1\"\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=\"p1\"\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 \u003cspan class=\"s1\"\u003e\u003cb\u003esame data codes\u003c\/b\u003e\u003c\/span\u003e on both tubes is a positive element, as it indicates batch consistency and greater production and aesthetic uniformity.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe construction is typical Sylvania of the era, with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003etop 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 legible green Baldwin silk-screen print. The 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 was 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 and was 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\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSolid, orderly, and well-controlled. The low range maintains good structure without being excessive, offering support and naturalness to musical reproduction.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eFull, musical, and well-present. Vocals and acoustic instruments sound credible, with a pleasant harmonic texture and a typically American tonal rendition.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp class=\"p1\"\u003eClean, balanced, and well-integrated. The high end maintains good openness without becoming aggressive, promoting smooth and natural listening.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eStable and responsive, with good ability to follow musical passages without stiffness. The very strong electrical behavior contributes to an authoritative and well-controlled performance.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eStable and coherent, favored by the matching between the two tubes and their origin from the same batch. The sound image is orderly, with good instrument separation and a balanced presentation between channels.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis pair of \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTB Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e is suitable for preamplifiers, driver stages, phase splitters, and compatible hi-fi circuits that require a stable, quiet, and musically balanced 6SN7.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, accurate matching, and \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection make it particularly suitable for systems where channel coherence, low noise, microphonics control, and operational reliability are important.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection also makes it suitable for sensitive hi-fi 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\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn instrument amplifiers and compatible circuits, this pair can offer a full, controlled, and dynamically stable response. The Sylvania construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eblack plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003ehalo getter\u003c\/b\u003e\u003c\/span\u003e contributes to a solid, musical, and well-defined sound character.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIt is an interesting choice for those seeking a \u003cspan class=\"s1\"\u003e\u003cb\u003evintage American 6SN7GTB\u003c\/b\u003e\u003c\/span\u003e pair with good robustness, balanced response, low noise, and predictable behavior in compatible musical applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for Audiophiles and Technicians\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis pair combines several important elements:\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSylvania Made in USA 1961 production\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003eBaldwin selection\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003esame data codes\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003eblack plates \/ halo getter construction\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003ereal test on Amplitrex AT-1000\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003eVERY STRONG result\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003ereal matching between two tubes\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003eLow Noise \u0026amp; Microphonics selection\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eA pair designed for those who want a \u003cspan class=\"s1\"\u003e\u003cb\u003evintage American 6SN7GTB\u003c\/b\u003e\u003c\/span\u003e that is not generic, but genuinely selected, tested, and ready for compatible hi-fi and musical applications where good electrical consistency, low noise, microphonics control, and vintage Sylvania sound character are required.\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 #16:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSection 1: Gm = 2500 ; Ia = 8.4 mA\u003c\/li\u003e\n\n\u003cli\u003eSection 2: Gm = 2600 ; Ia = 9.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #12:\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 = 2600 ; Ia = 9.2 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 in 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 well 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=\"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":"SYLVANIA","offers":[{"title":"Default Title","offer_id":58125025411420,"sku":"03687","price":731.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_8358dd04-e8fb-41c9-a849-7233f2ef2d6d.jpg?v=1782146666","url":"https:\/\/vacuumtubestreasures.com\/en-hk\/products\/6sn7gtb-baldwin-by-sylvania-matched-pair-black-plates-tubes-same-codes-made-in-usa-62","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}