{"product_id":"6sn7gta-nos-philco-by-sylvania-chrome-top-amplitrex-tested-tube-made-in-usa-50s","title":"6SN7GTA NOS PHILCO by SYLVANIA CHROME TOP AMPLITREX Tested Tube Made in USA '50s","description":"\u003cp\u003e\u003cstrong\u003e6SN7GTA NOS PHILCO by SYLVANIA CHROME TOP AMPLITREX Tested Tube Made in USA '50s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTA NOS Philco by Sylvania\u003c\/b\u003e\u003c\/span\u003e, manufactured in the USA in the 1950s, is a tube that combines the historical prestige of the \u003cspan class=\"s1\"\u003e\u003cb\u003ePhilco\u003c\/b\u003e\u003c\/span\u003e brand with the solid construction of \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania USA\u003c\/b\u003e\u003c\/span\u003e, one of the most highly regarded manufacturers of its time.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003ePhilco branded tubes were often selected for high-quality radio and audio applications, and in this case, we find a construction clearly traceable to Sylvania production, featuring the distinctive and sought-after \u003cspan class=\"s1\"\u003e\u003cb\u003eChrome Top\u003c\/b\u003e\u003c\/span\u003e, an iconic element both aesthetically and technically.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eConstruction features:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\u003cb\u003eChrome Top (extended top getter flashing)\u003c\/b\u003e\u003c\/li\u003e\n\u003cli class=\"p1\"\u003erobust and well-aligned internal structure\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eUSA production from the 1950s, a benchmark period for quality and reliability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThe Chrome Top indicates excellent internal vacuum quality, contributing to long-term stability and consistent performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tube has been tested with \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, achieving a \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e rating, and has been verified for \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e, making it suitable for even sensitive stages.\u003c\/p\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eSylvania Chrome Top 6SN7GTAs are known for an \u003cspan class=\"s1\"\u003e\u003cb\u003eopen, refined, and highly musical sound\u003c\/b\u003e\u003c\/span\u003e, with extremely balanced reproduction.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eControlled, fast, and well-articulated, with excellent intelligibility even in the most complex lines.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eNatural and transparent, with extremely credible and engaging vocal reproduction.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eExtended and airy, with excellent brightness yet always free from harshness.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eResponsive and fluid, with excellent ability to follow subtle signal variations.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eWide and three-dimensional, with precise placement of instruments in space.\u003c\/p\u003e\n\u003ch3 data-start=\"2348\" data-end=\"2713\"\u003e🎧 \u003cstrong data-start=\"2351\" data-end=\"2398\"\u003eUse in Hi-Fi Stereo Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003ePerfect for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003ehigh-end preamplifiers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eintegrated amplifiers and power amplifiers with 6SN7 drivers\u003c\/li\u003e\n\u003cli class=\"p1\"\u003ebuffers and line stages\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eIdeal for systems requiring \u003cspan class=\"s2\"\u003e\u003cb\u003etransparency, a wide soundstage, and great definition\u003c\/b\u003e\u003c\/span\u003e, without sacrificing the typical musicality of American NOS tubes.\u003c\/p\u003e\n\u003ch3 data-start=\"2715\" data-end=\"3044\"\u003e🎸 \u003cstrong data-start=\"2718\" data-end=\"2756\"\u003eUse in Instrument Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn musical applications, it offers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003egreat clarity and definition\u003c\/li\u003e\n\u003cli class=\"p1\"\u003econtrolled dynamic response\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eexcellent frequency separation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eSuitable for configurations where \u003cspan class=\"s2\"\u003e\u003cb\u003eprecision and signal purity\u003c\/b\u003e\u003c\/span\u003e are required, while maintaining a pleasant and non-fatiguing sonic character.\u003c\/p\u003e\n\u003ch3 data-start=\"3046\" data-end=\"3436\"\u003e🎯 \u003cstrong data-start=\"3049\" data-end=\"3081\"\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7GTA Philco by Sylvania Chrome Top\u003c\/b\u003e\u003c\/span\u003e represents a highly interesting tube for both practical use and historical value.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe Philco brand, combined with Sylvania production from the 1950s, guarantees solid construction and recognized sound quality.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cspan class=\"s2\"\u003eThe \u003c\/span\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003cspan class=\"s2\"\u003e test result on Amplitrex, along with the \u003c\/span\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003cspan class=\"s2\"\u003e verification, confirms a \u003c\/span\u003e\u003cb\u003estable, quiet tube ready for even demanding applications\u003c\/b\u003e\u003cspan class=\"s2\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eAn ideal choice for those seeking a \u003cspan class=\"s1\"\u003e\u003cb\u003e6SN7 with an open, precise, and three-dimensional sound\u003c\/b\u003e\u003c\/span\u003e, boasting the authenticity and charm of great vintage American production.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp data-start=\"3046\" data-end=\"3436\"\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003eAmplitrex AT-1000\u003c\/strong\u003e Tube tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -8V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAverage 100%\u003c\/strong\u003e \u003cstrong\u003eGm = 2600; Ia = 9.0 mA\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSection 1: Gm = 2400; Ia = 7.2 mA\u003c\/li\u003e\n\u003cli\u003eSection 2: Gm = 2580; 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 Low Noise \u0026amp; Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.\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\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 functional - 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 very well preserved, minimal signs of age. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e312 5421 - \u003cstrong data-start=\"336\" data-end=\"349\"\u003e312\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e→ EIA code Sylvania Electric Products Inc., New York 19, N. Y. - \u003cspan\u003e \u003c\/span\u003e\u003cstrong data-start=\"310\" data-end=\"317\"\u003e5421\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e→ 21st week of 1954\u003cmeta charset=\"utf-8\"\u003e\n\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":57058027503964,"sku":"03479","price":69.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_75d80b1a-dadf-48fd-ac1c-e31ddbb85314.jpg?v=1773910312","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/6sn7gta-nos-philco-by-sylvania-chrome-top-amplitrex-tested-tube-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}