{"product_id":"6sn7gt-sylvania-metal-base-tall-bottle-black-t-plates-chrome-top-made-in-usa-47","title":"6SN7GT SYLVANIA Metal Base Tall Bottle Black T-Plates Chrome Top - Made in USA '47","description":"\u003ch3 class=\"p1\"\u003e\u003cstrong\u003e6SN7GT SYLVANIA Metal Base Tall Bottle Black T‑Plates Chrome Top - Made in USA '47\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on an \u003cstrong\u003eAmplitrex AT-1000 Tube tester\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eVa = 250V, Vg = -8V\u003c\/li\u003e\n\n\u003cli\u003e\u003cstrong\u003eAverage 100% Gm = 2600 ; Ia = 9.0 mA\u003c\/strong\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eTube\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1: \u003c\/strong\u003eGm = 1900 ; Ia = 7.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2: \u003c\/strong\u003eGm = 2100 ; Ia = 7.0 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eAdditional Tests:\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eMicrophonics and noise:\u003c\/b\u003e\u003c\/span\u003e Low. Tested and compliant for use in hi-fi equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eBalance:\u003c\/b\u003e\u003c\/span\u003e Very good. The sections are consistent and well-matched, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eEmission:\u003c\/b\u003e\u003c\/span\u003e Strong – Strong and steady emission, suitable for any application.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cb\u003eShorts \/ Gas:\u003c\/b\u003e\u003cspan class=\"s1\"\u003e none\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eRare \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eUS-made 6SN7GT Sylvania\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, manufactured in the 52nd week of 1947 and featuring the prestigious \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emetal base, Tall Bottle, Black T‑Plates, and Chrome Top\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e configuration. An instantly recognizable construction, belonging to the early Sylvania productions and highly sought after for its historical interest, build quality, and reputation in audio applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe code \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e752\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies a Sylvania production from the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e52nd week of 1947\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The green markings are excellently preserved and allow for full appreciation of the tube's original aesthetics, including the distinctive metal base with the classic Sylvania logo.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tube has been carefully measured with an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT‑1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The two sections recorded \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 1900 \/ Ia 7.2 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGm 2100 \/ Ia 7.0 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e respectively, confirming strong and steady emission. The plate currents are very close, and the transconductance maintains good overall consistency, offering \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every good balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e for a vintage tube of this era.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe test also confirmed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise and microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, as well as an absence of gas or shorts. It is therefore recommended for hi-fi preamplifiers, headphone amplifiers, driver stages, and guitar amplifiers, even in the most sensitive audio positions. The good alignment of the sections also allows for its use as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ephase inverter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in applications that do not require absolute symmetry.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn terms of sound, early 6SN7GT Sylvania tubes with T‑Plates are appreciated for an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eopen, fast, and natural\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e presentation, with a well-focused midrange, detailed highs, and articulated, controlled low frequencies. The reproduction maintains notable liveliness without sacrificing musicality, favoring definition, instrument separation, and a wide, organized soundstage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAn exceptional offering for those desiring an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthentic 1947 Sylvania in the rare Metal Base version\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with Tall Bottle, Black T‑Plates, and Chrome Top: a cosmetically well-preserved specimen, carefully tested and ready to enhance quality audio equipment.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 class=\"p1\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eCondition:\u003c\/b\u003e\u003c\/span\u003e Vintage tube - Tested and perfectly functional. Supplied in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eFunctionality:\u003c\/b\u003e\u003c\/span\u003e Perfectly operational\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\n\n\u003cspan class=\"s1\"\u003e\u003cb\u003eCosmetic condition:\u003c\/b\u003e\u003c\/span\u003e Excellent – Markings excellently preserved, minimal signs of aging. See photos for details.\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing code:\u003c\/strong\u003e Manufacturer Sylvania Electric Products Inc., Emporium, Pa. - 752 → 7 (from three digits) → 1947 - 52 → 52nd week of the year\u003c\/li\u003e\n\n\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=\"Discover why our tubes are different – the VTT protocol that improves sound, reliability, and lifespan\" 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":59302754681180,"sku":"03848","price":158.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/9_e20d70ee-0c6c-4a7e-a5f0-d156fb754f05.jpg?v=1790603913","url":"https:\/\/vacuumtubestreasures.com\/en-gb\/products\/6sn7gt-sylvania-metal-base-tall-bottle-black-t-plates-chrome-top-made-in-usa-47","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}