{"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 1961","description":"\u003cp\u003e\u003cstrong\u003e12AX7 \/ ECC83 Baldwin by SYLVANIA - Matched Quad - Long Gray Plates Halo Getter USA 1961\u003c\/strong\u003e\u003c\/p\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\u003eGeneral Description\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003ematched quad of 12AX7 \/ ECC83 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, produced in the United States in 1961, represents one of the most appreciated American interpretations of the famous ECC83.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eBaldwin branded tubes were intended for the high-end electronic organs of the time and were selected by manufacturers who demanded reliability, quiet operation, and long service life. Behind the Baldwin brand, in this case, we find the renowned \u003cspan class=\"s1\"\u003e\u003cb\u003eSYLVANIA Made in USA\u003c\/b\u003e\u003c\/span\u003e production, recognizable by the construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eGray Plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e, a configuration particularly appreciated by enthusiasts for its tonal balance and natural musicality.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eSylvania Gray Plates from the early 1960s are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis quad has been carefully selected and matched using \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e, resulting in \u003cspan class=\"s1\"\u003e\u003cb\u003eSTRONG\u003c\/b\u003e\u003c\/span\u003e, quiet, and stable tubes with performance exceeding nominal reference values.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eFrom an aesthetic point of view, the tubes are in \u003cspan class=\"s1\"\u003e\u003cb\u003eexcellent condition\u003c\/b\u003e\u003c\/span\u003e, with well-preserved internal structure and still legible silkscreen printing.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSonic Characteristics\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eBaldwin by Sylvania Gray Plates possess the typical high-quality American sound character, distinguished by balance, musicality, and excellent intelligibility.\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 is well-controlled and defined, with good presence and articulation. They provide solidity to the low range without overwhelming the musical message.\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 mid-range is probably the strong point of this production. Voices appear natural, rich in harmonics, and well-focused in the soundstage.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe treble is open and detailed, but never aggressive. Environmental information and finer nuances are reproduced with naturalness and fluidity.\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\"\u003eDynamics are prompt and lively, with an engaging musical response that enhances both small ensembles and large orchestras.\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 is wide and well-organized, with good depth and correct instrument placement.\u003c\/p\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 matched quad is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eMulti-stage tube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eIntegrated hi-fi amplifiers\u003c\/li\u003e\n\n\u003cli\u003eMM and MC phono stages\u003c\/li\u003e\n\n\u003cli\u003eTube DACs\u003c\/li\u003e\n\n\u003cli\u003eBuffers and line stages\u003c\/li\u003e\n\n\u003cli\u003eRestorations of vintage American electronics\u003c\/li\u003e\n\n\u003cli\u003eApplications requiring multiple tubes with the most consistent behavior possible\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eThe \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e selection also makes it suitable for the most sensitive positions in the circuit.\u003c\/p\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=\"p4\"\u003eBaldwin by Sylvania Gray Plates are also highly appreciated by musicians due to their ability to offer:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eExcellent note definition\u003c\/li\u003e\n\n\u003cli\u003eRich and musical mids\u003c\/li\u003e\n\n\u003cli\u003eNatural dynamic response\u003c\/li\u003e\n\n\u003cli\u003eOpen but not aggressive sound\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003eParticularly interesting for guitar amplifiers that require clarity, articulation, and vintage American musicality.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for audiophiles and collectors\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eAuthentic \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Gray Plates from the early 1960s\u003c\/b\u003e\u003c\/span\u003e, especially when available with the Baldwin brand and in a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Quad\u003c\/b\u003e\u003c\/span\u003e configuration, represent a very interesting choice for those who desire the classic vintage American sound.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe combination of:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eSYLVANIA Made in USA production\u003c\/li\u003e\n\n\u003cli\u003eGray Plates\u003c\/li\u003e\n\n\u003cli\u003eHalo Getter\u003c\/li\u003e\n\n\u003cli\u003eMatched Quad\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\u003cli\u003eSTRONG performance\u003c\/li\u003e\n\n\u003cli\u003eExcellent aesthetic condition\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p2\"\u003emakes this set ideal for both quality hi-fi listening and for collectors and enthusiasts of American tube electronics.\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. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental 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 perfectly 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=\"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":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-lt\/products\/12ax7-ecc83-baldwin-by-sylvania-matched-quad-long-gray-plates-halo-getter-usa-1961","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}