{"product_id":"12ax7-ecc83-baldwin-by-sylvania-matched-quad-long-gray-plates-halo-getter-usa-1961","title":"12AX7 \/ ECC83 Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter USA '61","description":"\u003ch3\u003e\u003cstrong\u003e12AX7 \/ ECC83 Baldwin by SYLVANIA - Matched Quad - Long Gray Plates Halo Getter USA 1961\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMatched \u003c\/b\u003e\u003cstrong\u003eQuad\u003c\/strong\u003e\u003cb\u003e – AMPLITREX Tested – Low Noise \u0026amp; Microphonics – Vintage American Sylvania Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eMatched quad of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA 1961 \u003c\/b\u003e\u003c\/span\u003eproduction, selected for compatible hi-fi and musical applications where consistent, quiet tubes with classic vintage American sonic character are required.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eBaldwin-branded tubes were intended for high-end electronic organs of the era, where reliability, stability, and long operational life were essential requirements. In this case, the production is traceable to \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Made in USA\u003c\/b\u003e\u003c\/span\u003e, with \u003cspan class=\"s1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e construction, a configuration appreciated for its tonal balance, openness, and natural musicality.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tubes are in excellent aesthetic condition, with well-preserved internal structure and legible silkscreening. See photos for details.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe quad has been tested and selected using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e as a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Quad\u003c\/b\u003e\u003c\/span\u003e, with a \u003cspan class=\"s1\"\u003e\u003cb\u003eSTRONG \u003c\/b\u003e\u003c\/span\u003eresult and \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e classification. The matching between the four tubes makes it particularly interesting for multi-stage equipment or configurations requiring uniformity across multiple circuit positions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSonically, it offers a balanced, open, and musical performance, with controlled bass, natural and rich mids, clean and detailed highs that are not aggressive. The soundstage is orderly and stable, favored by the consistency of the quad and the typical character of early 1960s Sylvania production.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSuitable for multi-stage tube preamplifiers, integrated hi-fi amplifiers, compatible phono stages, tube DACs, buffers, line stages, vintage restorations, and instrument amplifiers compatible with \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eA truly selected, tested, and matched vintage American quad from Vacuum Tubes Treasures, ideal for those seeking quiet, consistent, and naturally musical \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Sylvania\u003c\/b\u003e\u003c\/span\u003e tubes.\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\u003cdiv\u003e\u003cstrong\u003eTube #1:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 1400 ; Ia = 0.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #5:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 1400 ; Ia = 0.8 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #7:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 1400 ; Ia = 0.9 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #8:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 1:\u003c\/strong\u003e Gm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cspan\u003e\u003cstrong\u003e Section 2:\u003c\/strong\u003e Gm = 1580 ; Ia = 1.0 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\n\u003c\/div\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 Low. Tested and suitable for hi-fi use, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. Sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\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\u003e Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection.\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 Excellent – Markings well-preserved, minimal signs of age. 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\u003e312 126 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 139 → 1 ( three digits ) → 1961 - 26 → 26th 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=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" 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":57796977819996,"sku":"03633T","price":179.8,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_680ee6c0-fbbb-4c91-8f1e-a130f22b03f8.jpg?v=1780589772","url":"https:\/\/vacuumtubestreasures.com\/en-ie\/products\/12ax7-ecc83-baldwin-by-sylvania-matched-quad-long-gray-plates-halo-getter-usa-1961","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}