{"product_id":"12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1960","title":"12AX7 ECC83 Baldwin by SYLVANIA – Matched Pair – Long Gray Plates Halo Getter USA 1959","description":"\u003cp\u003e\u003cstrong\u003e12AX7 ( ECC83 ) Baldwin by SYLVANIA Matched Pair Long Gray Plates Halo Getter Tubes Made in USA '59\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"703\" data-start=\"214\"\u003eThe \u003cstrong data-end=\"246\" data-start=\"217\"\u003e12AX7 Baldwin by Sylvania\u003c\/strong\u003e , manufactured in the \u003cstrong data-end=\"287\" data-start=\"263\"\u003eUSA in 1959\u003c\/strong\u003e , is a Baldwin organ valve selected by Sylvania with \u003cstrong data-end=\"387\" data-start=\"362\"\u003elong gray plates\u003c\/strong\u003e and \u003cstrong data-end=\"429\" data-start=\"390\"\u003ering getters\u003c\/strong\u003e \u003cstrong data-start=\"831\" data-end=\"871\"\u003e,\u003c\/strong\u003e built to exacting selection standards. This \u003cstrong data-end=\"499\" data-start=\"478\"\u003ematched pair\u003c\/strong\u003e represents a rare combination of \u003cstrong data-end=\"604\" data-start=\"537\"\u003enatural musicality, quiet operation, and tonal consistency\u003c\/strong\u003e , ideal for symmetrical stereo phono applications or high-precision multiple-channel configurations.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"900\" data-start=\"705\"\u003e\u003cstrong data-end=\"714\" data-start=\"705\"\u003eBass\u003c\/strong\u003e : Smooth and well-controlled, with a balanced presence free of bloat. They provide a solid and coherent foundation for the soundstage, with excellent articulation in the lower registers.\u003c\/li\u003e\n\u003cli data-end=\"1101\" data-start=\"902\"\u003e\u003cstrong data-end=\"910\" data-start=\"902\"\u003eMids\u003c\/strong\u003e : Warm, slightly euphonic, and rich in harmonics. Vocals and acoustic instruments emerge naturally and deeply, always maintaining a consistent timbre across the tubes in the group.\u003c\/li\u003e\n\u003cli data-end=\"1267\" data-start=\"1103\"\u003e\u003cstrong data-end=\"1111\" data-start=\"1103\"\u003eHighs\u003c\/strong\u003e : Airy and velvety, free from harshness. Even on highly analytical systems, the high range retains brilliance and musicality without tiring the listener.\u003c\/li\u003e\n\u003cli data-end=\"1465\" data-start=\"1269\"\u003e\u003cstrong data-end=\"1281\" data-start=\"1269\"\u003eDynamics\u003c\/strong\u003e : Smooth, musical, and well-balanced. The quartet delivers a cohesive and natural response, with well-managed microtransients and a linear, reliable behavior from each tube.\u003c\/li\u003e\n\u003cli data-end=\"1679\" data-start=\"1467\"\u003e\u003cstrong data-end=\"1481\" data-start=\"1467\"\u003eSoundstage\u003c\/strong\u003e : Wide, three-dimensional, and stable. Thanks to accurate matching, the soundstage is deeply coherent, with excellent separation between the sound planes and a sense of well-distributed space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"\" data-end=\"2051\" data-start=\"1681\"\u003eThis \u003cstrong data-end=\"1748\" data-start=\"1688\"\u003ematched pair of Sylvania 12AX7s made for Baldwin\u003c\/strong\u003e is an excellent choice for those seeking a \u003cstrong data-end=\"1848\" data-start=\"1791\"\u003erefined, musical, and smooth tonal presentation\u003c\/strong\u003e , ideal for \u003cstrong data-end=\"1979\" data-start=\"1861\"\u003epreamplifiers, dual-mono stereo amplifiers, balanced DACs, or high-end hi-fi systems\u003c\/strong\u003e where \u003cstrong data-end=\"2030\" data-start=\"1988\"\u003esymmetry and precision between channels\u003c\/strong\u003e make the difference.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2051\" data-start=\"1681\"\u003e\u003cmeta charset=\"utf-8\"\u003e 🎧 \u003cstrong\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2051\" data-start=\"1681\"\u003e\u003cmeta charset=\"utf-8\"\u003eIdeal for high-end tube hi-fi preamps, integrated amplifiers, and phono stages, these 12AX7s deliver \u003cstrong data-end=\"1852\" data-start=\"1794\"\u003erefined musicality and tonal consistency\u003c\/strong\u003e . Perfect for those seeking a classic 1950s American sound with maximum naturalness.\u003c\/p\u003e\n\u003cp data-start=\"215\" data-end=\"691\" class=\"\"\u003e🎸 \u003cstrong data-start=\"218\" data-end=\"263\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e \u003cbr data-start=\"263\" data-end=\"266\"\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"756\" data-start=\"247\"\u003e\u003cmeta charset=\"utf-8\"\u003e Also excellent for vintage guitar amplifiers (Fender, Ampeg, Gibson, etc.), where they provide \u003cstrong data-start=\"2095\" data-end=\"2159\"\u003eclarity, generous headroom, and musical harmonic distortion.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1072\" data-start=\"758\"\u003e🔊 \u003cstrong data-end=\"798\" data-start=\"761\"\u003eIdeal for musicians looking for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1072\" data-start=\"758\"\u003eTimbral uniformity and consistent response across all channels\u003c\/li\u003e\n\u003cli data-end=\"1072\" data-start=\"758\"\u003eClean three-dimensional, warm and well separated\u003c\/li\u003e\n\u003cli data-end=\"1072\" data-start=\"758\"\u003eA smooth and harmonic overdrive, ideal for jazz, blues and vintage rock\u003c\/li\u003e\n\u003cli data-end=\"1072\" data-start=\"758\"\u003eLow microphonics, perfect even in studio racks or professional live systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"\" data-end=\"2048\" data-start=\"1587\"\u003e🎯 \u003cstrong\u003eNote for Audiophiles and Technicians\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2048\" data-start=\"1587\"\u003eThis \u003cstrong\u003e1959 Baldwin by Sylvania matched pair\u003c\/strong\u003e is a “VERY STRONG” test-selected set and is perfect for both premium hi-fi listening and use in professional equipment and demanding musical instruments. A premium choice for collectors and enthusiasts.\u003cbr\u003e\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\u003e Tube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e \u003cspan\u003eVa = 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\u003cp\u003e\u003cstrong\u003eValve #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1400 ; Ia = 0.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eValve #9:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 1.0 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e \u003cspan\u003eGm = 1500 ; Ia = 0.9 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 Standard. Tested and approved for use in hi-fi and guitar amplifiers. Not recommended for the V1 position in high-sensitivity guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show consistent and well-aligned values.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped in our custom box for optimal protection.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAesthetic condition:\u003c\/strong\u003e Very good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e 312 913 → 312 indicates the manufacturer, i.e. Sylvania Electric Products Inc., Emporium, Pa. - 913 → 9 (out of 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 rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":56197138514268,"sku":"03306","price":89.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_44f81828-104a-4536-b065-781c2ed9af8c.jpg?v=1765364884","url":"https:\/\/vacuumtubestreasures.com\/en-sk\/products\/12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1960","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}