{"product_id":"12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1959","title":"12AX7 \/ ECC83 Baldwin by SYLVANIA - Matched Pair - Long Gray Plates Halo Getter USA 1959","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Baldwin by SYLVANIA Gray Plates Halo Getter Matched Pair Made in USA 1959\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eMatched Pair – 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=\"p2\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003ematched pair of 12AX7 \/ ECC83 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, produced in the United States in 1959, represents one of the most highly regarded American interpretations of the famous ECC83.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eValves branded \u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e were intended for high-end electronic organs of the era 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 its 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=\"p2\"\u003eSylvania Gray Plates from the late 1950s are known for their ability to combine detail, openness, and naturalness, offering an engaging yet never artificial reproduction.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThis pair has been carefully selected and verified using \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e, showing\u003cspan class=\"s1\"\u003e\u003cb\u003e\u0026nbsp;STRONG\u003c\/b\u003e\u003c\/span\u003e performance on both valves.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eFrom an aesthetic standpoint, the valves are in \u003cspan class=\"s1\"\u003e\u003cb\u003egood 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=\"p2\"\u003eBaldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, defined 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=\"p2\"\u003eThe bass is well-controlled and defined, with good presence and articulation. It provides solidity to the low-end without weighing down the musical message.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMidrange\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe midrange is probably the strong point of this production. Vocals 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=\"p2\"\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=\"p2\"\u003eThe dynamics are quick 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=\"p3\"\u003eThe soundstage is wide and well-organized, with good depth and correct placement of instruments.\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 pair is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTube preamplifiers\u003c\/li\u003e\n\u003cli\u003eIntegrated hi-fi amplifiers\u003c\/li\u003e\n\u003cli\u003eMM and MC phono stages\u003c\/li\u003e\n\u003cli\u003eTube DACs\u003c\/li\u003e\n\u003cli\u003eBuffers and line stages\u003c\/li\u003e\n\u003cli\u003eRestoration of vintage American electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\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\u003cli\u003eExcellent note definition\u003c\/li\u003e\n\u003cli\u003eRich and musical mids\u003c\/li\u003e\n\u003cli\u003eNatural dynamic response\u003c\/li\u003e\n\u003cli\u003eOpen but not aggressive sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\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=\"p2\"\u003eAuthentic \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Gray Plates from the late 1950s\u003c\/b\u003e\u003c\/span\u003e, especially when available with the Baldwin brand and in such well-preserved condition, represent a very interesting choice for those seeking the classic vintage American sound.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThe combination of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSYLVANIA Made in USA production\u003c\/li\u003e\n\u003cli\u003eGray Plates\u003c\/li\u003e\n\u003cli\u003eHalo Getter\u003c\/li\u003e\n\u003cli\u003eMatched Pair\u003c\/li\u003e\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\u003cli\u003eSTRONG performance on both valves\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003emakes this pair ideal for quality hi-fi listening as well as 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\u003eValve 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\u0026nbsp;STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1300 ; Ia = 0.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = 0.8 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = 0.7 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e1300 ; Ia = 0.7 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/div\u003e\n\u003cul\u003e\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 positions.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the valve suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Good Emission – Good and regular emission, suitable for any application\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\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 Vintage Valves - Tested and perfectly working, in electrical condition like NOS. 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 Very Good – Legible markings with slight 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 913 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 126 → 9 ( three digits ) → 1959 - 13 → 13th week of the year\u003c\/li\u003e\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 valves are different – the VTT protocol that improves sound, reliability, and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eDiscover why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":57802291151196,"sku":"03636T","price":8800.0,"currency_code":"ALL","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_22d9b695-6649-424b-a8fe-33da8024e298.jpg?v=1780669181","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1959","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}