{"product_id":"6sn7-gtb-nos-nib-philco-black-plates-chrome-top-tested-tube-made-in-usa-57","title":"6SN7GTB NOS NIB Philco by Sylvania – Black Plates Chrome Top Tested Tube USA 1957","description":"\u003cp\u003e\u003cstrong\u003e6SN7 GTB NOS NIB PHILCO Black Plates Chrome Top Tested Tube Made in USA '57\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"32\" data-end=\"525\"\u003eThe \u003cstrong data-start=\"35\" data-end=\"79\"\u003e6SN7 GTB PHILCO by Sylvania Black Plates\u003c\/strong\u003e , with \u003cstrong data-start=\"85\" data-end=\"99\"\u003eChrome Top\u003c\/strong\u003e , produced in the \u003cstrong data-start=\"116\" data-end=\"140\"\u003eUnited States in 1957\u003c\/strong\u003e , represent one of the best choices for those looking for a \u003cstrong data-start=\"200\" data-end=\"259\"\u003ebalanced, musical and detailed sound reproduction\u003c\/strong\u003e . \u003cstrong data-start=\"261\" data-end=\"298\"\u003eMade by Sylvania for PHILCO\u003c\/strong\u003e , these tubes combine the \u003cstrong data-start=\"328\" data-end=\"381\"\u003etypical transparency and articulation of Sylvania\u003c\/strong\u003e with a \u003cstrong data-start=\"390\" data-end=\"436\"\u003eslightly warmer and more harmonious tone\u003c\/strong\u003e , making them perfect for \u003cstrong data-start=\"462\" data-end=\"522\"\u003ehi-fi preamplifiers and vintage tube amplifiers\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cul data-start=\"527\" data-end=\"1600\"\u003e\n\u003cli data-start=\"527\" data-end=\"730\"\u003e\u003cstrong data-start=\"529\" data-end=\"538\"\u003eBass\u003c\/strong\u003e : \u003cstrong data-start=\"540\" data-end=\"570\"\u003eWell defined and controlled\u003c\/strong\u003e , with a \u003cstrong data-start=\"592\" data-end=\"621\"\u003edeep but never intrusive\u003c\/strong\u003e low range. Excellent articulation allows for \u003cstrong data-start=\"676\" data-end=\"696\"\u003eclean and precise\u003c\/strong\u003e reproduction, without unwanted bloating.\u003c\/li\u003e\n\u003cli data-start=\"731\" data-end=\"970\"\u003e\u003cstrong data-start=\"733\" data-end=\"741\"\u003eMids\u003c\/strong\u003e : \u003cstrong data-start=\"743\" data-end=\"788\"\u003eNatural, detailed and slightly warm\u003c\/strong\u003e , with exceptional instrument separation. Voices are \u003cstrong data-start=\"853\" data-end=\"881\"\u003eenveloping and realistic\u003c\/strong\u003e , while acoustic instruments enjoy \u003cstrong data-start=\"927\" data-end=\"967\"\u003ethree-dimensional clarity and presence\u003c\/strong\u003e .\u003c\/li\u003e\n\u003cli data-start=\"971\" data-end=\"1182\"\u003e\u003cstrong data-start=\"973\" data-end=\"981\"\u003eHighs\u003c\/strong\u003e : \u003cstrong data-start=\"983\" data-end=\"1005\"\u003eExtended and refined\u003c\/strong\u003e , with a \u003cstrong data-start=\"1020\" data-end=\"1038\"\u003esweet and silky\u003c\/strong\u003e performance, free from harshness or fatigue. The detail is extraordinary but always musical, ensuring a \u003cstrong data-start=\"1151\" data-end=\"1179\"\u003etransparent and balanced\u003c\/strong\u003e sound performance.\u003c\/li\u003e\n\u003cli data-start=\"1183\" data-end=\"1444\"\u003e\u003cstrong data-start=\"1185\" data-end=\"1197\"\u003eDynamics\u003c\/strong\u003e : \u003cstrong data-start=\"1199\" data-end=\"1220\"\u003eResponsive and fluid\u003c\/strong\u003e , with \u003cstrong data-start=\"1254\" data-end=\"1275\"\u003erapid and natural\u003c\/strong\u003e transient management, ensuring an \u003cstrong data-start=\"1299\" data-end=\"1328\"\u003eengaging and articulated\u003c\/strong\u003e sound, capable of delivering \u003cstrong data-start=\"1351\" data-end=\"1412\"\u003eboth the most delicate nuances and the most energetic passages\u003c\/strong\u003e with precision and naturalness.\u003c\/li\u003e\n\u003cli data-start=\"1445\" data-end=\"1600\"\u003e\u003cstrong data-start=\"1447\" data-end=\"1461\"\u003eSoundstage\u003c\/strong\u003e : \u003cstrong data-start=\"1463\" data-end=\"1481\"\u003eWide and airy\u003c\/strong\u003e , with excellent separation between instruments and a three-dimensional rendering that gives depth to the soundstage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1602\" data-end=\"2013\"\u003eThanks to their \u003cstrong data-start=\"1619\" data-end=\"1673\"\u003erobust construction, with Black Plates and Chrome Top\u003c\/strong\u003e , these \u003cstrong data-start=\"1682\" data-end=\"1713\"\u003e6SN7 GTB PHILCO by Sylvania\u003c\/strong\u003e offer \u003cstrong data-start=\"1722\" data-end=\"1780\"\u003eexcellent operational stability and reduced microphony\u003c\/strong\u003e , making them ideal for \u003cstrong data-start=\"1804\" data-end=\"1858\"\u003edemanding audiophiles and high-end hi-fi systems\u003c\/strong\u003e . Their \u003cstrong data-start=\"1868\" data-end=\"1918\"\u003ewarm, detailed and harmonically rich sound\u003c\/strong\u003e makes them an excellent choice for those who want \u003cstrong data-start=\"1984\" data-end=\"2010\"\u003etransparent and musical\u003c\/strong\u003e reproduction.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eValve tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 250V ; Vg = -8V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e \u003cspan\u003e\u003cmeta charset=\"utf-8\"\u003eGm = 2600 ; Ia = 9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2600 ; Ia = 8.2 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 2400 ; Ia = 7.6 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 Standard – Tested and approved for use in hi-fi systems and guitar amplifiers.\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 NOS - NIB - New Old Stock, New In Box - Tested and working - 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\u003eAesthetic condition:\u003c\/strong\u003e Excellent – Perfectly preserved writing, minimal signs of wear. See photos.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 312 - 572? - Manufactured by Sylvania in 1957\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":"PHILCO","offers":[{"title":"Default Title","offer_id":54055211237724,"sku":"02784","price":42.44,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/4_588cb6ac-dc6d-406f-bef5-67eaff81f226.jpg?v=1740588685","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/6sn7-gtb-nos-nib-philco-black-plates-chrome-top-tested-tube-made-in-usa-57","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}