{"product_id":"6v6-gt-tung-sol-black-glass-getter-tested-tube-made-in-usa","title":"6V6 GT DELCO by TUNG-SOL Black Glass Square Getter Tested Tube MADE IN USA '51","description":"\u003cp class=\"p1\"\u003e\u003cstrong\u003e6V6GT DELCO by TUNG-SOL Black Glass Square Getter Tested Tube MADE IN USA '51 AMPLITREX Tested Tube\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eGeneral Description\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThe \u003cspan class=\"s2\"\u003e\u003cb\u003e1951 6V6GT DELCO by TUNG-SOL Black Glass\u003c\/b\u003e\u003c\/span\u003e represents one of the most authentic expressions of American post-war production. Manufactured by \u003cspan class=\"s2\"\u003e\u003cb\u003eTung-Sol for DELCO\u003c\/b\u003e\u003c\/span\u003e, this tube combines high industrial quality with a construction typical of the most sought-after series, featuring \u003cspan class=\"s2\"\u003e\u003cb\u003eBlack Glass\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s2\"\u003e\u003cb\u003eSquare Getter\u003c\/b\u003e\u003c\/span\u003e, distinguishing elements of the finest productions of that era.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe black glass is not just an aesthetic choice; it contributes to better emission management and more stable performance over time. The \u003cspan class=\"s2\"\u003e\u003cb\u003emanufacturing code 322 112\u003c\/b\u003e\u003c\/span\u003e confirms Tung-Sol production, synonymous with reliability and manufacturing consistency.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThis is a \u003cspan class=\"s2\"\u003e\u003cb\u003eused but selected and tested tube\u003c\/b\u003e\u003c\/span\u003e, which fully retains the charm and musicality of 1950s American 6V6s.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eTested with \u003cspan class=\"s2\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, it delivered a \u003cspan class=\"s2\"\u003e\u003cb\u003eSTRONG\u003c\/b\u003e\u003c\/span\u003e result, confirming excellent operational performance.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eSound Characteristics\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBass\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eWarm and round, with a rich texture typical of the best Tung-Sol productions. Never overwhelming, but always well-articulated.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMidrange\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eRich and engaging, with a natural harmonic texture. Voices emerge with realism and depth.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eSweet and refined, never aggressive. They offer detail without fatigue, maintaining fluid musicality.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eProgressive and musical, with an organic response that enhances the naturalness 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 good separation and credible instrument placement.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis 6V6GT is ideal for systems where a \u003cspan class=\"s2\"\u003e\u003cb\u003ewarm, musical, and engaging sound\u003c\/b\u003e\u003c\/span\u003e, typical of 1950s American tubes, is desired.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eParticularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003esingle-ended amplifiers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003evintage configurations\u003c\/li\u003e\n\u003cli class=\"p1\"\u003esystems oriented towards musicality rather than pure analytical precision\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eIn guitar applications, it offers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003esoft and progressive breakup\u003c\/li\u003e\n\u003cli class=\"p1\"\u003egreat expressiveness in the mids\u003c\/li\u003e\n\u003cli class=\"p1\"\u003enatural dynamic response\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003ePerfect for those seeking the classic \"vintage American tone.\"\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎯 Note for audiophiles and technicians\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eManufacturer:\u003c\/b\u003e\u003c\/span\u003e Tung-Sol (DELCO branded)\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eYear:\u003c\/b\u003e\u003c\/span\u003e 1951\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eConstruction:\u003c\/b\u003e\u003c\/span\u003e Black Glass – Square Getter\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eFactory code:\u003c\/b\u003e\u003cspan class=\"s1\"\u003e 322 112\u003c\/span\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest:\u003c\/b\u003e\u003c\/span\u003e AMPLITREX AT-1000\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eA tube with strong historical and sonic character, capable of offering an \u003cspan class=\"s2\"\u003e\u003cb\u003eauthentically American voice\u003c\/b\u003e\u003c\/span\u003e, ideal for those who desire a warm, natural sound rich in personality.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;Va = 250V; Vg2 = 250V; Vg = -12.5V\u0026nbsp;\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMeasurements taken after 10 minutes of warm-up.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;Gm = 4.1 ; Ia = 45 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e\u0026nbsp;STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003cspan\u003eGm = 4.1 ; Ia = 37 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u0026nbsp;\u003c\/strong\u003eLow. Tested and suitable for use in hi-fi, including phono stages and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e\u0026nbsp;Excellent – Strong and stable emission, without fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort Circuits and GAS:\u003c\/strong\u003e\u0026nbsp;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 data-start=\"221\" data-end=\"371\"\u003e\u003cstrong data-start=\"223\" data-end=\"233\"\u003eCondition:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eVintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\u0026nbsp;\u003c\/li\u003e\n\u003cli data-start=\"372\" data-end=\"456\"\u003e\u003cstrong data-start=\"374\" data-end=\"391\"\u003eFunctionality:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eFully operational, with excellent test results.\u003c\/li\u003e\n\u003cli data-start=\"457\" data-end=\"672\"\u003e\u003cstrong data-start=\"459\" data-end=\"484\"\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eVery Good – lettering clearly legible. There is a \u003cspan class=\"s2\"\u003e\u003cb\u003esmall crack on the plastic base\u003c\/b\u003e\u003c\/span\u003e, visible in the photos. This is an exclusively aesthetic defect that \u003cspan class=\"s2\"\u003e\u003cb\u003edoes not affect functionality\u003c\/b\u003e\u003c\/span\u003e, as confirmed by tests.\u003c\/span\u003e\u003cstrong data-start=\"675\" data-end=\"703\"\u003e\u003c\/strong\u003e See photos for details.\u003c\/li\u003e\n\u003cli data-start=\"457\" data-end=\"672\"\u003e\u003cstrong data-start=\"675\" data-end=\"703\" style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eManufacturing code:\u003c\/strong\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e 322 112 - 322 → Tung-Sol Electric Inc., Newark 4, N. J. - 112 → RMA\/EIA Open Date Code → manufactured in the 12th week of 1951\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\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\/span\u003e\u003c\/p\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":48007042695516,"sku":"02139","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_46cc560c-21d9-4652-b365-28f33d141ee4.jpg?v=1713272411","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/6v6-gt-tung-sol-black-glass-getter-tested-tube-made-in-usa-en","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}