{"product_id":"6v6-gt-tung-sol-nos-nib-black-glass-square-getter-matched-tubes-made-in-usa-55","title":"6V6GT NOS NIB TUNG-SOL Black Glass Matched Pair Tubes Square Getter Same Codes Made in USA '55","description":"\u003cp class=\"p1\"\u003e\u003cb\u003e6V6GT NOS NIB TUNG-SOL – Black Glass – Matched Pair – Square Getter – Same Codes – Made in USA 1955\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eGeneral Description\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThis \u003cspan class=\"s2\"\u003e\u003cb\u003ematched pair of 6V6GT NOS NIB Tung-Sol\u003c\/b\u003e\u003c\/span\u003e tubes, manufactured in the USA in \u003cspan class=\"s2\"\u003e\u003cb\u003e1955\u003c\/b\u003e\u003c\/span\u003e, represents one of the most iconic and sought-after versions of the American 6V6 family.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe tubes feature the famous construction:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eBlack Glass\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSquare Getter\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003etypical Tung-Sol internal structure from the 1950s\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003e\u003cspan class=\"s2\"\u003e\u003cb\u003eBlack glass\u003c\/b\u003e\u003c\/span\u003e is particularly appreciated for the quality of its materials and its distinctive sonic character, while the \u003cspan class=\"s2\"\u003e\u003cb\u003esquare getter\u003c\/b\u003e\u003c\/span\u003e identifies an early production, which is increasingly rare today.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eBoth tubes bear \u003cspan class=\"s2\"\u003e\u003cb\u003ethe same manufacturing code 322550-3\u003c\/b\u003e\u003c\/span\u003e, confirming their origin from the same production batch.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s3\"\u003eThe pair is \u003c\/span\u003e\u003cb\u003eNOS NIB (New Old Stock – New In Box)\u003c\/b\u003e\u003cspan class=\"s3\"\u003e and has been selected as a \u003c\/span\u003e\u003cb\u003eMatched Pair\u003c\/b\u003e\u003cspan class=\"s3\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003e⚠️ One tube has a \u003cspan class=\"s2\"\u003e\u003cb\u003esmall crack on the plastic base\u003c\/b\u003e\u003c\/span\u003e, as shown in the photos. This is a purely cosmetic defect that \u003cspan class=\"s2\"\u003e\u003cb\u003edoes not affect functionality\u003c\/b\u003e\u003c\/span\u003e, as confirmed by tests.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThe \u003cspan class=\"s2\"\u003e\u003cb\u003eTung-Sol 6V6GT Black Glass from the 1950s\u003c\/b\u003e\u003c\/span\u003e are considered among the best in terms of musicality and character.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eDeep and well-structured, with excellent control and natural presence.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eRich, warm, and three-dimensional. Vocals sound extremely natural and engaging.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eSweet and refined, with a soft texture that avoids any harshness.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eFluid and progressive, with a very musical and natural response.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eWide and well-developed, with excellent depth and separation.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eIdeal for amplifiers based on:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003e6V6GT \/ 6V6G \/ 6V6GTY\u003c\/b\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eParticularly suitable for hi-fi systems seeking:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003emusicality and naturalness\u003c\/li\u003e\n\u003cli class=\"p1\"\u003erich midrange\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ewarm and engaging sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eMatching and electrical consistency ensure stable performance in push-pull circuits.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eAlso highly valued in guitar amplifiers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003esoft and progressive breakup\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ewarm and harmonically complex mids\u003c\/li\u003e\n\u003cli class=\"p1\"\u003every expressive dynamic response\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eA classic choice for those who desire an authentic vintage sound.\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\u003cb\u003eTung-Sol – Made in USA – 1955\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eBlack Glass – Square Getter\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSame Factory Code: 322550-3\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eMatched Pair\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eNOS NIB – New Old Stock, New In Box\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p4\"\u003eA valuable pair, combining \u003cspan class=\"s2\"\u003e\u003cb\u003erarity, build quality, and sonic performance\u003c\/b\u003e\u003c\/span\u003e, ideal for those seeking a \u003cspan class=\"s2\"\u003e\u003cb\u003ereference vintage 6V6GT\u003c\/b\u003e\u003c\/span\u003e, with the charm and musicality of 1950s American production.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eVa = 250V; Vg2 = 250V; Vg = -12.5V \u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMeasurements taken after 10 minutes of warm-up.\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003cmeta charset=\"utf-8\"\u003eGm = 4.1 ; Ia = 45 mA\u003c\/span\u003e\n\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\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 4.1 ; Ia = 43.0 mA\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e \u003cmeta charset=\"utf-8\"\u003e\u003cspan\u003eGm = 4.2 ; Ia = 43.0 mA\u003c\/span\u003e\u003cstrong\u003e\u003c\/strong\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: \u003c\/strong\u003eLow. Tested and suitable for hi-fi use, even in phono stages and guitar amplifiers.\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\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"221\" data-end=\"371\"\u003e\n\u003cstrong data-start=\"223\" data-end=\"233\"\u003eCondition:\u003c\/strong\u003e NOS - NIB - New Old Stock, New In Box - Tested and functional - Supplied in original box.\u003c\/li\u003e\n\u003cli data-start=\"372\" data-end=\"456\"\u003e\n\u003cstrong data-start=\"374\" data-end=\"391\"\u003eFunctionality:\u003c\/strong\u003e Fully operational, with excellent test results.\u003c\/li\u003e\n\u003cli data-start=\"457\" data-end=\"672\"\u003e\n\u003cstrong data-start=\"459\" data-end=\"484\"\u003eCosmetic Condition:\u003c\/strong\u003e Markings excellently preserved, \u003cmeta charset=\"utf-8\"\u003eOne tube has a \u003cspan class=\"s2\"\u003e\u003cb\u003esmall crack on the plastic base\u003c\/b\u003e\u003c\/span\u003e, as shown in the photos. This is a purely cosmetic defect that \u003cspan class=\"s2\"\u003e\u003cb\u003edoes not affect functionality\u003c\/b\u003e\u003c\/span\u003e, as confirmed by tests. See photos for details.\u003c\/li\u003e\n\u003cli data-start=\"673\" data-end=\"797\"\u003e\n\u003cstrong data-start=\"675\" data-end=\"703\"\u003eManufacturing Code: \u003c\/strong\u003e322550-3 \u003cmeta charset=\"utf-8\"\u003e- 322 \u003cmeta charset=\"utf-8\"\u003e→ Tung-Sol Electric Inc., Newark 4, N. J. - 550 → RMA\/EIA Open Date Code → manufactured in the 50th week of 1955\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"TUNG-SOL","offers":[{"title":"Default Title","offer_id":49515817533788,"sku":"02485","price":189.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_2eedafaa-deb0-4b8c-8adc-e2620c07155e.jpg?v=1728553267","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/copy-of-6v6gt-tung-sol-black-glass-foil-getter-matched-tubes-made-in-usa-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}