{"product_id":"12ax7-ecc83-nos-baldwin-by-sylvania-matched-quad-long-gray-plates-halo-getter-usa-62","title":"12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter USA '61","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Matched Quad Made in USA 1961\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMatched Quad – AMPLITREX Tested – Vintage American Sylvania Production\u003c\/b\u003e\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\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e\u0026nbsp;\u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #10:\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eSection 1: \u003cmeta charset=\"utf-8\"\u003eGm = 1700 ; Ia = 1.1 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Section 2: Gm = 1850 ; Ia = 1.2 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #14\u003c\/strong\u003e:\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 1900 ; Ia = 1.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Section 2: Gm = 1700 ; Ia = 1.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #4:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 1900 ; Ia = 1.1 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Section 2: Gm = 2000 ; Ia = 1.4 mA\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eTube #20\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e Section 1: Gm = 2000 ; Ia = 1.4 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e Section 2: Gm = 1900 ; Ia = 1.2 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAdditional Tests Performed\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p2\"\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eMicrophonics:\u003c\/b\u003e Standard. Tested and suitable for use in hi-fi equipment and guitar amplifiers. Recommended for V2, V3, and V4 positions, as drivers or in less critical stages. For V1 and for high-gain positions particularly sensitive to microphonics, we recommend a tube with low microphonics selection.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eBalance:\u003c\/b\u003e The sections are consistent and well-aligned, making the tubes also suitable for use as phase inverters in hi-fi and instrumental applications.\u003c\/li\u003e\n\u003cli class=\"p3\"\u003e\u003cb\u003eEmission Quality:\u003c\/b\u003e Excellent – very strong and stable emission, without fluctuations.\u003c\/li\u003e\n\u003cli class=\"p2\"\u003e\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003cspan class=\"s2\"\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eMatched quad of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 NOS Baldwin by Sylvania\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMade in USA, 1961\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e production, selected for compatible hi-fi and musical applications where channel consistency, good operational stability, and authentic vintage American sound character are required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBaldwin-branded tubes were intended for high-end electronic organs of the era, where reliability, long lifespan, and operational uniformity were fundamental requirements. In this case, production is attributable to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eSylvania Made in USA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, featuring \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eGray Plates\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHalo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, a configuration appreciated for its tonal balance, openness, and natural musicality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tubes are in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS – New Old Stock\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e condition, with well-preserved internal structure, very strong electrical values, and clearly legible lettering. See photos for aesthetic details.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe quad has been carefully tested and selected using an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000 Tube Tester\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e as a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMatched Quad\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVERY STRONG\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e result on all tubes. The microphonics level is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eStandard\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: the tubes are tested and suitable for use in hi-fi equipment and guitar amplifiers, particularly recommended for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV2, V3, and V4\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e positions, as drivers or in less critical stages. For \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV1\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and for high-gain positions particularly sensitive to microphonics, we recommend a specific \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eLow Noise \u0026amp; Microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e selection instead.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSonically, they offer a balanced, open, and engaging performance, with controlled bass, natural and rich mids, clean and detailed but not aggressive highs. The soundstage is orderly and stable, with good channel coherence and the typical musical character of early 1960s American Sylvania production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for tube preamplifiers, hi-fi integrated amplifiers, driver stages, tube DACs, buffers, line stages, vintage restorations, and instrument amplifiers compatible with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA truly selected, tested, and matched \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS Sylvania\/Baldwin\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e quad from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eVacuum Tubes Treasures\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, ideal for those seeking four strong, musical, and consistent \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmerican 12AX7 \/ ECC83\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes, with the reliability and charm of vintage USA production.\u003c\/span\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\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\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u0026nbsp;\u003c\/strong\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Excellent – Lettering perfectly preserved, minimal signs of age. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code: \u003c\/strong\u003e312 152 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 152 → 1 (out of three digits) → 1961 - 52 → 52nd week of the year\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" 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":58842943422812,"sku":"03757","price":881.0,"currency_code":"ILS","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_cd7bb5f0-5c55-4d95-8911-31cdd70c6a59.jpg?v=1787848911","url":"https:\/\/vacuumtubestreasures.com\/en-il\/products\/12ax7-ecc83-nos-baldwin-by-sylvania-matched-quad-long-gray-plates-halo-getter-usa-62","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}