{"product_id":"12au7a-ecc82-nos-baldwin-by-sylvania-long-gray-plates-halo-getter-matched-quad-tubes-made-in-usa-60s-1","title":"12AU7A \/ ECC82 NOS Baldwin by SYLVANIA Long Gray Plates Halo Getter Matched Quad Tubes Made in USA '60s","description":"\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7 \/ ECC82 NOS Baldwin by SYLVANIA Matched Quad Long Gray Plates Halo Getter AMPLITREX Tested Made in USA ’60\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003e\u003cb\u003eAMPLITREX Matched Quad – Low Noise \u0026amp; Microphonics – Vintage American SYLVANIA Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis matched quartet of \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7 \/ ECC82 NOS Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA 1960\u003c\/b\u003e\u003c\/span\u003e production, represents a high-level American selection, designed for hi-fi and musical applications where valve consistency, quietness, and operational stability are fundamental.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eValves branded \u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e were intended for musical and professional applications, particularly high-quality electronic organs, where reliable, stable, and quiet valves were required. Behind the Baldwin brand, in this case, we find the production of \u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Electric Products Inc.\u003c\/b\u003e\u003c\/span\u003e, recognizable by its construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe quartet comes from the same manufacturing code \u003cspan class=\"s1\"\u003e\u003cb\u003e312 052\u003c\/b\u003e\u003c\/span\u003e, traceable to the \u003cspan class=\"s1\"\u003e\u003cb\u003e52nd week of 1960\u003c\/b\u003e\u003c\/span\u003e. This element adds technical and collectible value, offering great production consistency among the four units.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe valves are in \u003cspan class=\"s1\"\u003e\u003cb\u003eNOS – New Old Stock\u003c\/b\u003e\u003c\/span\u003e condition, tested and selected using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e as a \u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Quad\u003c\/b\u003e\u003c\/span\u003e, with an overall \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, low microphonics, low noise, and passed a \u003cspan class=\"s1\"\u003e\u003cb\u003e48h Burning Test\u003c\/b\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe strength of this quartet is not only its very solid electrical state but, above all, the consistency of the values among the four valves, a particularly important feature in equipment that uses multiple 12AU7 \/ ECC82s in the same circuit.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eFrom an aesthetic point of view, the quartet is in \u003cspan class=\"s1\"\u003e\u003cb\u003eexcellent\u003c\/b\u003e\u003c\/span\u003e condition, with perfectly preserved labels, a clean internal structure, and minimal signs of aging. See photos for details.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTonal Characteristics and Sound Description\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eSylvania Long Gray Plates from the early 1960s are appreciated for a balanced, open, and natural sound reproduction, with a very recognizable American musicality.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eIn this matched quad selection, the consistency among the four valves contributes to a stable, orderly, and very pleasant presentation, ideal for equipment that uses multiple 12AU7 \/ ECC82s in the same circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe bass range is controlled, articulate, and well-supported. It provides a solid foundation without being intrusive, maintaining rhythm and clarity even in the most complex passages.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMidrange\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe midrange is natural, clear, and musical. Vocals and acoustic instruments are well-focused, with a balanced and pleasant harmonic texture.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTreble\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThe treble range is open and clean, with good extension and a smooth, never aggressive, presentation. Detail remains well-integrated into the musical message.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eDynamics are prompt and consistent, with a stable and well-controlled response. The matching of the quartet helps maintain uniformity and tonal continuity between different circuit positions.\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 appears wide, stable, and well-organized. The consistency of the quartet promotes proper instrument separation and a balanced presentation between channels.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎧 Use in Hi-Fi Stereo Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis matched quartet is particularly suitable for:\u003c\/p\u003e\n\u003cp class=\"p3\"\u003emulti-stage tube preamplifiers\u003cbr\u003eline stages\u003cbr\u003edriver stages\u003cbr\u003eintegrated amplifiers\u003cbr\u003eDACs and tube buffers\u003cbr\u003ehi-fi equipment using multiple 12AU7 \/ ECC82s\u003cbr\u003erestorations of vintage American electronics\u003c\/p\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 sensitive applications, including compatible phono stages and positions where quietness and consistency among valves are essential.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎸 Use in Musical Instrument Amplifiers\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eIn musical instrument amplifiers and compatible professional equipment, these \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7 \/ ECC82 Baldwin by Sylvania\u003c\/b\u003e\u003c\/span\u003e can offer:\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eexcellent operational stability\u003cbr\u003enatural harmonic response\u003cbr\u003econtained noise\u003cbr\u003elow microphonics\u003cbr\u003econsistent behavior among the four valves\u003cbr\u003egood signal intelligibility\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThese characteristics make the quartet interesting both in the studio and in live applications, always respecting the technical compatibility of the equipment.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e🎯 Note for Audiophiles and Technicians\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003eThis quartet combines elements particularly appreciated by enthusiasts:\u003c\/p\u003e\n\u003cp class=\"p2\"\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Made in USA\u003c\/b\u003e\u003c\/span\u003e production\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBaldwin\u003c\/b\u003e\u003c\/span\u003e brand\u003cbr\u003esame manufacturing code \u003cspan class=\"s1\"\u003e\u003cb\u003e312 052\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e1960\u003c\/b\u003e\u003c\/span\u003e production\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHalo Getter\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMatched Quad\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e48h Burning Test – OK\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e performance on all valves\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eA high-level selection for those who want a truly consistent, quiet, and stable quartet, capable of offering the charm of vintage American production with modern, accurate, and documented verification.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Results\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p2\"\u003eValves tested on \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000 Tube Tester\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eTest Conditions:\u003c\/b\u003e Va = 250V, Vg = -8.5V\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAverage 100%:\u003c\/b\u003e\u003c\/span\u003e Gm = 2200 ; Ia = 10.5 mA\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eTest Result:\u003c\/b\u003e\u003c\/span\u003e VERY STRONG\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eValve #27\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2100 ; Ia = 8.6 mA\u003cbr\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2200 ; Ia = 9.2 mA\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eValve #7\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2200 ; Ia = 8.6 mA\u003cbr\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2200 ; Ia = 9.6 mA\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eValve #15\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2100 ; Ia = 8.6 mA\u003cbr\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2300 ; Ia = 9.6 mA\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eValve #26\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = \u003cmeta charset=\"utf-8\"\u003e2200 ; Ia = 9.2 mA\u003cbr\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2200 ; Ia = 9.4 mA\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAdditional Tests Performed\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eBurning Test:\u003c\/b\u003e 48h – OK\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMicrophonics:\u003c\/b\u003e\u003c\/span\u003e Low. Tested and suitable for hi-fi use, even in phono stages and guitar amplifiers. Also suitable for V1.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBalance:\u003c\/b\u003e\u003c\/span\u003e The sections are consistent and well-aligned, making the valves also suitable for use as phase inverters in hi-fi and instrumental applications.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eEmission Quality:\u003c\/b\u003e\u003c\/span\u003e Excellent – very strong and stable emission, without fluctuations.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eShorts and GAS:\u003c\/b\u003e\u003c\/span\u003e Absent.\u003c\/p\u003e\n\u003ch3\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eCondition\u003c\/b\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eCondition:\u003c\/b\u003e NOS – New Old Stock – tested and working. Supplied in our custom box for optimal protection.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eFunctionality:\u003c\/b\u003e\u003c\/span\u003e Perfectly operational.\u003cbr\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eAesthetic Condition:\u003c\/b\u003e\u003c\/span\u003e Excellent – perfectly preserved labels, minimal signs of aging. See photos for details.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eManufacturing Code: \u003c\/b\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e312 052\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e → 312 indicates the manufacturer, which is \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eSylvania Electric Products Inc., Emporium, Pa. - \u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e052\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e → 0 indicates \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e1960\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e, 52 indicates the \u003c\/span\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003e52nd week of the year\u003c\/b\u003e\u003c\/span\u003e\u003cspan class=\"s2\"\u003e.\u003c\/span\u003e\u003c\/p\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":58060842172764,"sku":"03654L","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_a3676e14-179d-41cb-8f78-7677b8a36db3.jpg?v=1781258563","url":"https:\/\/vacuumtubestreasures.com\/en-ee\/products\/12au7a-ecc82-nos-baldwin-by-sylvania-long-gray-plates-halo-getter-matched-quad-tubes-made-in-usa-60s-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}