{"product_id":"6sl7gt-sylvania-3-hole-black-plates-tall-boys-amplitrex-matched-pair-same-date-codes-made-in-usa","title":"6SL7GT SYLVANIA 3-Hole Black Plates Tall Boys AMPLITREX Matched Pair Same Date Codes Made in USA '50s","description":"\u003cp\u003e\u003cstrong\u003e6SL7GT SYLVANIA 3-Hole Black Plates Tall Boys AMPLITREX Matched Pair Same Date Codes Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"0\" data-end=\"784\"\u003e\u003cstrong data-start=\"3\" data-end=\"27\"\u003eGeneral Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003epair of 6SL7GT SYLVANIA “Tall Boys”\u003c\/b\u003e\u003c\/span\u003e, made in the United States, represents one of the most fascinating and sought-after versions of the American 6SL7 family.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWe are talking about an iconic configuration, immediately recognizable by:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003e3-Hole Black Plates\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eTall Boys\u003c\/b\u003e structure (tall bottle, typical of early productions)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSame Date Codes\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eentirely \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA\u003c\/b\u003e\u003c\/span\u003e construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eSylvania \"Tall Boys\" are among the most appreciated by enthusiasts for their scenic aesthetics and their rich and natural sound character.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis is a \u003cspan class=\"s1\"\u003e\u003cb\u003eselected and matched used pair\u003c\/b\u003e\u003c\/span\u003e, not a random combination, but a careful selection with:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003every well-balanced sections\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003econsistent electrical behavior\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eA pair that stands out for its balance, consistency and overall high-level presentation.\u003c\/p\u003e\n\u003ch3 data-start=\"786\" data-end=\"999\"\u003e\u003cstrong data-start=\"788\" data-end=\"814\"\u003eSonic Characteristics\u003c\/strong\u003e\u003cbr data-start=\"814\" data-end=\"817\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBass\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSoft and well-articulated, with a natural presence that supports the scene without weighing it down.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMids\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eAbsolute strong point: rich, textural, and three-dimensional. Vocals emerge with great naturalness and engagement.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHighs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSweet and well-extended, never aggressive. They offer air and detail while maintaining a consistently musical rendering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDynamics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFluid and progressive, with a natural response that prioritizes musicality and coherence.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSoundstage\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWide and airy, with a well-developed scene and credible instrument separation.\u003c\/p\u003e\n\u003ch3 data-end=\"1875\" data-start=\"1819\"\u003e🎧 \u003cstrong data-end=\"1859\" data-start=\"1822\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003etube preamplifiers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003einput stages\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ecircuits where musicality and naturalness are required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThanks to its \u003cspan class=\"s2\"\u003e\u003cb\u003elow noise and good internal balance\u003c\/b\u003e\u003c\/span\u003e, it is also suitable for sensitive positions in the circuit.\u003c\/p\u003e\n\u003ch3 data-end=\"2229\" data-start=\"2177\"\u003e🎸 \u003cstrong data-end=\"2213\" data-start=\"2180\"\u003eUse in Musical Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eExcellent choice for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003evintage instrument amplifiers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003etube preamplifiers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThey offer:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003egreat expressiveness in the mids\u003c\/li\u003e\n\u003cli class=\"p1\"\u003emusical dynamic response\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eauthentically \"vintage\" sound character\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"2611\" data-start=\"2509\"\u003e🎯\u0026nbsp;\u003cstrong data-end=\"2544\" data-start=\"2512\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-end=\"2547\" data-start=\"2544\"\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSYLVANIA USA – vintage production\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003e3-Hole Black Plates – Tall Boys\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSame Date Codes\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSelected Matched Pair\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eVery well-balanced sections\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eA pair that not only functions correctly but also expresses \u003cspan class=\"s1\"\u003e\u003cb\u003esonic identity, balance, and historical charm\u003c\/b\u003e\u003c\/span\u003e, perfect for those who want to include a \u003cspan class=\"s1\"\u003e\u003cb\u003eselected and musically satisfying American 6SL7\u003c\/b\u003e\u003c\/span\u003e in their system.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3 data-end=\"3436\" data-start=\"3046\"\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on\u0026nbsp;\u003cstrong\u003eAmplitrex AT-1000 Tube tester\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eVa = 250V, Vg = -2V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%: \u003c\/strong\u003eGm = 1600 ; Ia = 2.3 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1300 ; Ia = 1.9 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = 2.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1300 ; Ia = 1.9 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = 2.0 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and suitable for hi-fi use, even in phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Both sections show consistent and well-aligned values, making the tube ideal as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Strong – Strong and regular emission, suitable for any application.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage Tubes - Tested and fully functional - Supplied in Original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u0026nbsp;\u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e Excellent – Labels well preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003e018 → Sylvania Electric Products Inc., Emporium, Pa. - \u003cmeta charset=\"utf-8\"\u003e018 → 0 ( three digits ) → 1950 - 18 → 18th week of the year\u003c\/li\u003e\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":57301745697116,"sku":"03515","price":218000.0,"currency_code":"KRW","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_503f038e-4630-4bea-b033-01e9b9ffaf2a.jpg?v=1775663245","url":"https:\/\/vacuumtubestreasures.com\/en-kr\/products\/6sl7gt-sylvania-3-hole-black-plates-tall-boys-amplitrex-matched-pair-same-date-codes-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}