{"product_id":"6sl7gt-amperex-globe-matched-pair-black-plates-square-getter-tubes-usa-60s","title":"6SL7GT AMPEREX GLOBE AMPLITREX Tested Pair Black Plates Square Getter Tubes USA 60s","description":"\u003cp\u003e\u003cstrong\u003e6SL7GT AMPEREX GLOBE AMPLITREX Tested Pair Black Plates Square Getter Tubes USA 60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"0\" data-end=\"784\"\u003e\u003cstrong data-start=\"3\" data-end=\"27\"\u003eDescription\u003c\/strong\u003e\u003cbr data-start=\"27\" data-end=\"30\"\u003e\u003cmeta charset=\"utf-8\"\u003e This \u003cstrong data-end=\"71\" data-start=\"37\"\u003epair of 6SL7GT AMPEREX GLOBE\u003c\/strong\u003e , \u003cstrong data-end=\"100\" data-start=\"84\"\u003eUSA production from the 1960s\u003c\/strong\u003e , is a version of great historical and sonically interest, \u003cstrong data-end=\"196\" data-start=\"155\"\u003emade by RCA for the Amperex Company\u003c\/strong\u003e . These examples feature \u003cstrong data-end=\"239\" data-start=\"223\"\u003eblack plates\u003c\/strong\u003e , \u003cstrong data-end=\"258\" data-start=\"241\"\u003esquare getters\u003c\/strong\u003e and the characteristic \u003cstrong data-end=\"295\" data-start=\"279\"\u003esmoked glass\u003c\/strong\u003e , typical elements of the best RCA productions of the time destined for leading brands such as Amperex. \u003cbr data-end=\"404\" data-start=\"401\"\u003eThe tubes have been \u003cstrong data-end=\"459\" data-start=\"426\"\u003etested with the Amplitrex AT-1000\u003c\/strong\u003e and both are in \u003cstrong data-is-only-node=\"\" data-end=\"515\" data-start=\"495\"\u003eTEST VERY STRONG\u003c\/strong\u003e conditions, with high output, stable operation and no shorts or gas.\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"786\" data-end=\"999\"\u003e\u003cstrong data-start=\"788\" data-end=\"814\"\u003eSound Characteristics\u003c\/strong\u003e \u003cbr data-start=\"814\" data-end=\"817\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003c\/p\u003e\n\u003cp data-end=\"926\" data-start=\"730\"\u003eThe 6SL7 RCA black plates with smoked glass are appreciated for their rich, authoritative and very musical tone, with a very recognizable classic American character.\u003c\/p\u003e\n\u003cp data-end=\"1065\" data-start=\"928\"\u003e\u003cstrong data-end=\"937\" data-start=\"928\"\u003eBass\u003c\/strong\u003e\u003cbr data-end=\"940\" data-start=\"937\"\u003eFull, solid, and well-controlled. The low end has body and depth, while maintaining good articulation and stability.\u003c\/p\u003e\n\u003cp data-end=\"1288\" data-start=\"1067\"\u003e\u003cstrong data-end=\"1075\" data-start=\"1067\"\u003eMedium\u003c\/strong\u003e\u003cbr data-end=\"1078\" data-start=\"1075\"\u003eWarm, dense, and highly expressive. Vocals sound natural and present, with a particularly convincing performance on jazz, blues, and vocal music.\u003cbr data-end=\"1225\" data-start=\"1222\"\u003eThe midrange is one of the strong points of this RCA configuration.\u003c\/p\u003e\n\u003cp data-end=\"1461\" data-start=\"1290\"\u003e\u003cstrong data-end=\"1298\" data-start=\"1290\"\u003eHigh\u003c\/strong\u003e\u003cbr data-end=\"1301\" data-start=\"1298\"\u003eSmooth, fluid, and never aggressive. The smoked glass contributes to an elegant and slightly silky presentation, with a well-integrated, harsh-free finish.\u003c\/p\u003e\n\u003cp data-end=\"1630\" data-start=\"1463\"\u003e\u003cstrong data-end=\"1475\" data-start=\"1463\"\u003eDynamics\u003c\/strong\u003e\u003cbr data-end=\"1478\" data-start=\"1475\"\u003eRobust and progressive. The response is energetic but controlled, with a very musical behavior consistent with the \u003cstrong data-end=\"1615\" data-start=\"1600\"\u003eVERY STRONG\u003c\/strong\u003e state of the tubes.\u003c\/p\u003e\n\u003cp data-end=\"1817\" data-start=\"1632\"\u003e\u003cstrong data-end=\"1646\" data-start=\"1632\"\u003eSoundstage\u003c\/strong\u003e\u003cbr data-end=\"1649\" data-start=\"1646\"\u003eWide and three-dimensional, with good depth and separation of musical lines. The soundstage is stable and natural, typical of the best American 6SL7s of the 1960s.\u003c\/p\u003e\n\u003cp data-end=\"1875\" data-start=\"1819\"\u003e🎧 \u003cstrong data-end=\"1859\" data-start=\"1822\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"1862\" data-start=\"1859\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-end=\"2007\" data-start=\"1876\"\u003e\n\u003cli data-end=\"1907\" data-start=\"1876\"\u003e\n\u003cp data-end=\"1907\" data-start=\"1878\"\u003etube preamplifiers,\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1939\" data-start=\"1908\"\u003e\n\u003cp data-end=\"1939\" data-start=\"1910\"\u003einput and driver stages,\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2007\" data-start=\"1940\"\u003e\n\u003cp data-end=\"2007\" data-start=\"1942\"\u003eVintage American and European amplifiers using 6SL7s.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2175\" data-start=\"2009\"\u003eThe warm and authoritative timbre makes them ideal for jazz, vocal, classical and prolonged listening, as long as a perfect balance between the two tubes is not required.\u003c\/p\u003e\n\u003cp data-end=\"2229\" data-start=\"2177\"\u003e🎸 \u003cstrong data-end=\"2213\" data-start=\"2180\"\u003eUse in Music Amplifiers\u003c\/strong\u003e\u003cbr data-end=\"2216\" data-start=\"2213\"\u003eExcellent for:\u003c\/p\u003e\n\u003cul data-end=\"2378\" data-start=\"2230\"\u003e\n\u003cli data-end=\"2278\" data-start=\"2230\"\u003e\n\u003cp data-end=\"2278\" data-start=\"2232\"\u003eguitar and bass amplifiers with 6SL7,\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2311\" data-start=\"2279\"\u003e\n\u003cp data-end=\"2311\" data-start=\"2281\"\u003evintage circuits and boutiques,\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2378\" data-start=\"2312\"\u003e\n\u003cp data-end=\"2378\" data-start=\"2314\"\u003epositions where character, body and rich harmonics are sought.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2507\" data-start=\"2380\"\u003eMicrophonics: Standard. Recommended for use in V2, V3, V4, as a driver or in less critical stages. Not recommended for V1.\u003c\/p\u003e\n\u003cp 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\u003c\/p\u003e\n\u003cp data-is-only-node=\"\" data-is-last-node=\"\" data-end=\"3063\" data-start=\"2810\"\u003eA premium choice for enthusiasts, restorers, and musicians seeking authentic 1960s RCA tone, with the allure of the Amperex Globe brand.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp data-end=\"3436\" data-start=\"3046\"\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eValves tested on \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\"\u003e Va = 250V, Vg = -2V\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100% Gm = 1600 ; Ia = 2.3 mA\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1700 ; Ia = 2.3 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm =\u003cmeta charset=\"utf-8\"\u003e 1700 ; Ia = 2.5 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 1400 ; Ia = 2.0 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm =\u003cmeta charset=\"utf-8\"\u003e 1500 ; Ia = 2.1 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 Standard. Tested and approved for use in hi-fi and guitar amplifiers. Recommended for use in V2, V3, V4, as a driver, or in less critical stages. Not recommended for use in V1.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The two sections show coherent and well-aligned values, making the valve also ideal as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits 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 Valves - Tested and in perfect working order - Supplied in original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eExcellent – Excellently preserved lettering, minimal signs of wear. 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\u003e None – Made by RCA USA for AMPEREX, identifiable by its construction features. 1960s\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":56240411967836,"sku":"03314","price":84.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_c6c86e30-ec14-41a2-8d5b-f4f671b1361b.jpg?v=1765823387","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/6sl7gt-amperex-globe-matched-pair-black-plates-square-getter-tubes-usa-60s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}