{"product_id":"jan-chs-6sl7wgt-nos-nib-sylvania-brown-base-square-getter-amplitrex-tested-pair-made-in-usa-50s","title":"JAN-CHS 6SL7WGT NOS NIB SYLVANIA Brown Base Square Getter AMPLITREX Tested Pair Made in USA '50s","description":"\u003cp class=\"p1\"\u003e\u003cb\u003eJAN-CHS 6SL7WGT NOS NIB SYLVANIA Brown Base Square Getter AMPLITREX Tested Pair Made in USA ’50s\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"0\" data-end=\"784\"\u003e\u003cstrong data-start=\"3\" data=\"27\"\u003eGeneral Description\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003epair of JAN-CHS 6SL7WGT SYLVANIA NOS NIB tubes\u003c\/b\u003e\u003c\/span\u003e, produced in the United States in the 1950s, represents an absolute top-tier selection, combining \u003cspan class=\"s1\"\u003e\u003cb\u003emilitary prestige, build quality, and strong sonic identity\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe acronym \u003cspan class=\"s1\"\u003e\u003cb\u003eJAN-CHS (Joint Army-Navy – Contract High Specification)\u003c\/b\u003e\u003c\/span\u003e identifies production intended for military use, manufactured according to extremely rigorous standards in terms of reliability, durability, and operational stability.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThese tubes feature a typical construction of the more robust and sought-after versions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eWGT (reinforced version)\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBrown Base\u003c\/b\u003e\u003c\/span\u003e (elegant and highly resistant brown base)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eSquare Getter\u003c\/b\u003e\u003c\/span\u003e (visually striking and distinctive square getter)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003eproduction \u003c\/span\u003e\u003cb\u003eSYLVANIA USA – 1950s\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThis is an \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS NIB (New Old Stock, with original boxes) pair\u003c\/b\u003e\u003c\/span\u003e, selected and tested, not just a random match but a quality proposition, chosen for coherence and overall performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eAlthough not a matched pair, the tubes show solid electrical behavior and a \u003cspan class=\"s1\"\u003e\u003cb\u003ewell-aligned internal balance\u003c\/b\u003e\u003c\/span\u003e, making them perfectly usable in many hi-fi and musical applications.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eTested with \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, they achieved:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eResult: VERY STRONG\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eInternal VTT Classification: VERY STRONG\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"786\" data-end=\"999\"\u003e\n\u003cstrong data-start=\"788\" data-end=\"814\"\u003eSonic Characteristics\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBass\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eFull and well-structured, with a solid foundation that lends stability to the entire sonic range.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eRich, textured, and deeply musical. Vocals emerge with naturalness and presence, typical of great American production.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eSweet and refined, with good extension and always smooth, never fatiguing reproduction.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eLively and controlled, with a progressive response that enhances every nuance of the signal.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eWide and three-dimensional, with an airy 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\n\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 stability and musicality are required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThanks to the \u003cspan class=\"s2\"\u003e\u003cb\u003eWGT construction and JAN selection\u003c\/b\u003e\u003c\/span\u003e, they offer reliable performance even in sensitive positions, with balanced and engaging sound reproduction.\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\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003ePerfect 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\"\u003enatural dynamic response\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eauthentic 1950s sonic character\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"2611\" data-start=\"2509\"\u003e🎯 \u003cstrong data-end=\"2544\" data-start=\"2512\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-end=\"2547\" data-start=\"2544\"\u003e\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eJAN-CHS – USA military production\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSYLVANIA – 1950s\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003e6SL7WGT (reinforced version)\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eBrown Base – Square Getter\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eNOS NIB with original boxes\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSelected pair (not matched)\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\u003eVTT Classification: VERY STRONG\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eA pair that goes beyond simple use: a \u003cspan class=\"s1\"\u003e\u003cb\u003etrue testament to American military production\u003c\/b\u003e\u003c\/span\u003e, capable of offering \u003cspan class=\"s1\"\u003e\u003cb\u003ereliability, musicality, and a distinctive sonic identity\u003c\/b\u003e\u003c\/span\u003e, ideal for those seeking a superior 6SL7.\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 \u003cstrong\u003eAmplitrex AT-1000 Tube tester\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003eVa = 250V, Vg = -2V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%: \u003c\/strong\u003eGm = 1600 ; Ia = 2.3 mA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY 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 class=\"p1\"\u003eSection 1: Gm = 1800 ; Ia = 2.4 mA\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eSection 2: Gm = 2000 ; Ia = 2.7 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 class=\"p1\"\u003eSection 1: Gm = 1400 ; Ia = 1.7 mA\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eSection 2: Gm = 1500 ; Ia = 1.7 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 compliant for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance: \u003c\/strong\u003eSections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\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\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\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e One Tube Excellent – Markings excellently preserved, minimal signs of age. The other Good – Markings partially eroded, but still legible. Tube body in good condition. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e510 → Sylvania Electric Products Inc., Emporium, Pa. - \u003cmeta charset=\"utf-8\"\u003e510 → 0 ( three digits ) → 1955 - 10 → 10th week of the year\u003c\/li\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e??? → Sylvania Electric Products Inc., Emporium, Pa. - \u003cmeta charset=\"utf-8\"\u003e??? → undecipherable, identifiable by construction characteristics. 1950s\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=\"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":57319935476060,"sku":"03517-ONSPEC","price":141.0,"currency_code":"CHF","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_8599fa78-cce0-49b0-982d-4a829c903458.jpg?v=1775812460","url":"https:\/\/vacuumtubestreasures.com\/en-ch\/products\/jan-chs-6sl7wgt-nos-nib-sylvania-brown-base-square-getter-amplitrex-tested-pair-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}