{"product_id":"12ax7-ecc83-sylvania-long-black-plates-foil-getter-amplitrex-tested-tube-usa-1950s","title":"12AX7 \/ ECC83 Sylvania Long Black Plates Foil Getter Amplitrex Tested Tube USA 1950s","description":"\u003cp\u003e\u003cstrong\u003e12AX7 ( ECC83 ) SYLVANIA Long Black Plates Foil Getter 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\u003e12AX7 \/ ECC83 SYLVANIA\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA 1950s production\u003c\/b\u003e\u003c\/span\u003e, represents one of the most appreciated configurations of the historic American production of small signal tubes.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eLong Black Plates\u003c\/b\u003e\u003c\/span\u003e and characteristic \u003cspan class=\"s1\"\u003e\u003cb\u003eFoil Getter\u003c\/b\u003e\u003c\/span\u003e identifies a type highly sought after today by vintage electronics enthusiasts for its construction quality, historical charm, and sonic personality.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eIt is a used tube, carefully tested and selected in our laboratory using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSylvania productions with long black plates have always been appreciated for their ability to combine musicality, balance, and naturalness, while maintaining that typical American sound signature that made the best tubes of the era famous.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eFrom an aesthetic point of view, the tube retains the authentic charm of 1950s vintage productions, with the characteristic internal structure of long black plates that continues to attract the interest of audiophiles, technicians, and collectors today.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e12AX7 Sylvania Long Black Plates are generally appreciated for an balanced, natural, and harmonically rich sound presentation.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eTheir sound signature tends to favor fluidity, tonal accuracy, and a remarkable ability to reproduce the musical message in a credible and engaging way.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe bass range is well controlled and natural, with a good sense of solidity and a consistently orderly and musical presentation.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe mids represent one of the strengths of this production. Vocals are credible and well-focused, while acoustic instruments and harmonics maintain a rich and pleasant texture.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe high range is fluid and well integrated into the overall sound context. Detail is present without being artificial, favoring prolonged and relaxed listening.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe dynamic response is natural and progressive, with a good ability to follow musical variations while maintaining coherence and control.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSoundstage\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe soundstage appears stable and well organized, with correct instrument separation and a credible spatial presentation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThis SYLVANIA ECC83 \/ 12AX7 is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003ehi-fi preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eline stages\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003evintage and modern integrated amplifiers\u003c\/li\u003e\n\n\u003cli\u003ecompatible driver stages\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise\u003c\/b\u003e\u003c\/span\u003e selection makes it particularly interesting for applications where quietness and tonal naturalness are important characteristics.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Applications\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIn the field of musical instrument amplifiers, Sylvania Long Black Plates are highly appreciated for their balanced and musical character.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThis tube offers:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003egood harmonic response\u003c\/li\u003e\n\n\u003cli\u003enatural and well-present mids\u003c\/li\u003e\n\n\u003cli\u003eprogressive dynamic behavior\u003c\/li\u003e\n\n\u003cli\u003econtained noise\u003c\/li\u003e\n\n\u003cli\u003eauthentic vintage character\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eThese characteristics make it interesting for both vintage amplifiers and compatible boutique creations.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for audiophiles and technicians\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p4\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 SYLVANIA Long Black Plates Foil Getter Made in USA 1950s\u003c\/b\u003e\u003c\/span\u003e represents a remarkable American vintage selection for those who desire a true vintage ECC83 with:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eLong Black Plates construction\u003c\/li\u003e\n\n\u003cli\u003eFoil Getter\u003c\/li\u003e\n\n\u003cli\u003eLow Noise\u003c\/li\u003e\n\n\u003cli\u003ewell-balanced sections\u003c\/li\u003e\n\n\u003cli\u003etypical musicality of vintage American production\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThe internal VTT classification is \u003cspan class=\"s1\"\u003e\u003cb\u003eSTRONG\u003c\/b\u003e\u003c\/span\u003e, with a regular electrical profile, stable emission, and well-aligned sections.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eA tube that retains the authentic charm of the best Sylvania productions from the golden age, selected according to Vacuum Tubes Treasures standards.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on \u003cstrong\u003eAMPLITREX AT-1000 \u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\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\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1400 ; Ia = 0.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1400 ; Ia = 0.9 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Standard. Tested and suitable 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 in V1 or in very high gain positions particularly sensitive to microphonics.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eBalance: \u003c\/strong\u003eThe sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Strong – Strong and regular emission, suitable for any application.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eCondition: \u003c\/strong\u003eVintage - Tested and working - Supplied as shown in photos. \u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eFunctionality: \u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic Condition:\u003c\/strong\u003e Fair – Markings completely disappeared. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e absent – SYLVANIA USA production, identifiable by construction characteristics. 1950s\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=\"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":57761271251292,"sku":"03616T","price":98.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/3_b14bb1dc-be8b-4ca2-bbcf-4fdd23e64da4.jpg?v=1780057535","url":"https:\/\/vacuumtubestreasures.com\/en-ca\/products\/12ax7-ecc83-sylvania-long-black-plates-foil-getter-amplitrex-tested-tube-usa-1950s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}