{"product_id":"12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1962","title":"12AX7 \/ ECC83 Baldwin by SYLVANIA - Matched Pair - Long Gray Plates Halo Getter USA 1961","description":"\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 NOS Baldwin by SYLVANIA Gray Plates Halo Getter Matched Pair Made in USA 1961\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 1961, represents one of the most appreciated American interpretations of the famous ECC83.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eBaldwin-branded tubes were intended for high-end electronic organs of the era and were selected by manufacturers who demanded reliability, quiet operation, and long operational 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=\"p2\"\u003eEarly 1960s Sylvania Gray Plates 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, resulting in \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e performance on both tubes, with results exceeding nominal reference values.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eFrom an aesthetic point of view, the tubes are in \u003cspan class=\"s1\"\u003e\u003cb\u003eexcellent condition\u003c\/b\u003e\u003c\/span\u003e, with a well-preserved internal structure and well-legible lettering.\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\"\u003eThe Baldwin by Sylvania Gray Plates possess the typical high-quality American sonic character, characterized 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\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\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\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eThe highs are open and detailed, but never aggressive. Environmental information and the finest 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 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=\"p3\"\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 pair is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eTube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eHi-fi integrated 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\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\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 yet non-aggressive sound\u003c\/li\u003e\n\n\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 early 1960s\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 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 Pair\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\u003cli\u003eVERY STRONG performance on both tubes\u003c\/li\u003e\n\n\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\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 VERY STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #8:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1800 ; Ia = 1.2 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = 1400 ; Ia = 0.9 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #13:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003cspan\u003e Gm = 1800 ; Ia = 1.2 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e Gm = 1500 ; Ia = 1.0 mA\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\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 positions.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Good. The sections exhibit consistent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between sections is not required.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, without fluctuations.\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 – Lettering 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 139 → 312 indicates the manufacturer, Sylvania Electric Products Inc., Emporium, Pa. - 139 → 1 (three digits) → 1961 - 39 → 39th week of the year\u003c\/li\u003e\n\n\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\u003eDiscover why our tubes are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":57795165225308,"sku":"03628T","price":3210.0,"currency_code":"CZK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_e9eea1ff-d84e-44e0-a134-d9d61df802ba.jpg?v=1780555955","url":"https:\/\/vacuumtubestreasures.com\/en-cz\/products\/12ax7-ecc83-baldwin-by-sylvania-matched-pair-long-gray-plates-halo-getter-usa-1962","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}