{"product_id":"6sl7gt-vt-229-sylvania-nos-black-round-plates-foil-getter-amplitrex-matched-pair-made-in-usa-50s","title":"6SL7GT (VT-229) SYLVANIA NOS Black Round Plates Foil Getter AMPLITREX Matched Pair Made in USA '50s.","description":"\u003cp\u003e\u003cstrong\u003e6SL7GT (VT-229) SYLVANIA NOS Black Round Plates Foil Getter AMPLITREX Matched Pair 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 (VT-229) SYLVANIA NOS tubes\u003c\/b\u003e\u003c\/span\u003e, manufactured in the United States in the 1950s, represents an offering of great historical and sonic appeal, perfectly in line with the best American production of the era.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tubes are distinguished by a particularly refined construction:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eBlack Round Plates\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eFoil Getter\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003eManufactured by \u003c\/span\u003e\u003cb\u003eSYLVANIA USA – 1950s\u003c\/b\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eAn iconic configuration that combines collector's value and musical performance, increasingly difficult to find in NOS condition.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis is a \u003cspan class=\"s1\"\u003e\u003cb\u003eselected and offered matched pair\u003c\/b\u003e\u003c\/span\u003e, the result of careful selection aimed at overall consistency and sound performance.\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 an \u003cb\u003einternal VTT Classification: VERY STRONG\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tubes offer stable electrical behavior and consistent balance between sections, making them perfectly usable in hi-fi and musical applications.\u003c\/p\u003e\n\u003ch3 data-start=\"786\" data-end=\"999\"\u003e\n\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\n\u003c\/h3\u003e\n\u003cp\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eFull and well-articulated, with a natural presence that gives solidity to the soundstage.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eRich, textural, and engaging. Vocals emerge with great naturalness, delivering an authentically vintage timbre.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eSweet and well-extended, with a fluid and never aggressive rendition.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eNatural and progressive, with a musical response that enhances every nuance.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eWide and three-dimensional, with good depth 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\"\u003esystems oriented towards musicality and timbral realism\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThis pair offers a \u003cspan class=\"s2\"\u003e\u003cb\u003ewarm, balanced, and engaging sound\u003c\/b\u003e\u003c\/span\u003e, perfect for enhancing quality listening.\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\"\u003eExcellent choice for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003einstrument amplifiers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003evintage 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 sound 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\u003eSYLVANIA USA – 1950s\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eBlack Round Plates – Foil Getter\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eSelected pair offered as a matched pair\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\"\u003e\u003cspan class=\"s1\"\u003eA pair that combines \u003c\/span\u003e\u003cb\u003eprestige, vintage construction, and rich, musical sound\u003c\/b\u003e\u003cspan class=\"s1\"\u003e, ideal for those who desire an \u003c\/span\u003e\u003cb\u003eauthentic, selected American 6SL7 with a strong sonic identity\u003c\/b\u003e\u003cspan class=\"s1\"\u003e.\u003c\/span\u003e\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 = 1500 ; Ia = 2.5 mA\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eSection 2: Gm = 1500 ; Ia = 2.5 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 = 2.2 mA\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eSection 2: Gm = 1600 ; Ia = 2.6 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, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003cstrong\u003eBalance: \u003c\/strong\u003e\u003c\/span\u003eThe sections exhibit consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.\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 - New Old Stock - Tested and working - Supplied in our custom box for optimal protection. \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 Excellent – Markings excellently preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003eabsent, identifiable by construction characteristics. 1950s → Sylvania Electric Products Inc., Emporium, Pa.\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":57331127451996,"sku":"03522L_ON-SPEC","price":197.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_47f63f6a-2885-4ed9-9ca1-2f85feaccbc7.jpg?v=1775921361","url":"https:\/\/vacuumtubestreasures.com\/en-ca\/products\/6sl7gt-vt-229-sylvania-nos-black-round-plates-foil-getter-amplitrex-matched-pair-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}