{"product_id":"12au7-ecc82-telefunken-nos-amplitrex-tested-smooth-plates-diamond-bottom-made-in-west-germany","title":"12AU7 \/ ECC82 TELEFUNKEN NOS Amplitrex Tested - Smooth Plates - ◊ Diamond Bottom - Made in West Germany","description":"\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003e12AU7 ECC82 NOS TELEFUNKEN Amplitrex Tested Smooth Plates Tubes ◊ Diamond Bottom Made in W. Germany\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This \u003cspan class=\"s1\"\u003e\u003cb\u003e12AU7 \/ ECC82 TELEFUNKEN NOS\u003c\/b\u003e\u003c\/span\u003e , produced in \u003cspan class=\"s1\"\u003e\u003cb\u003eWest Germany\u003c\/b\u003e\u003c\/span\u003e , is an original example identifiable by the characteristic \u003cspan class=\"s1\"\u003e\u003cb\u003e◊ Diamond Bottom\u003c\/b\u003e\u003c\/span\u003e on the case back, an unmistakable mark of Telefunken production.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The construction with \u003cspan class=\"s1\"\u003e\u003cb\u003esmooth plates\u003c\/b\u003e\u003c\/span\u003e is among the most appreciated by audiophiles for its tonal balance, electrical stability and coherence over time.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e This is an \u003cspan class=\"s1\"\u003e\u003cb\u003eauthentic NOS (New Old Stock)\u003c\/b\u003e\u003c\/span\u003e tube, never used, tested in our laboratory with \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e to verify its output, stability and correct functioning.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eA select specimen, designed for high-level hi-fi and professional applications.\u003c\/p\u003e\n\n\u003cp class=\"p1\" style=\"text-align: left;\"\u003e Rated \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e , it is also suitable for sensitive circuit positions.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eBass:\u003c\/strong\u003e Controlled, linear, and well-structured. The low range is precise and never intrusive, with excellent articulation and rhythmic coherence.\u003c\/p\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eMids:\u003c\/strong\u003e Neutral, refined, and highly transparent. Voices emerge naturally and cleanly, without any pronounced coloration. Acoustic instruments and strings are defined and harmonically complete.\u003c\/p\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eHighs:\u003c\/strong\u003e Extended, airy, and finely detailed. The upper end is clean and well-controlled, with a fine texture that favors prolonged listening even on high-resolution systems.\u003c\/p\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eDynamics:\u003c\/strong\u003e Balanced and composed. Excellent microdynamics and linear transient response, with consistently predictable and consistent behavior.\u003c\/p\u003e\n\n \u003cp style=\"text-align: left;\"\u003e\u003cstrong\u003eSoundstage:\u003c\/strong\u003e Stable, well-organized, and three-dimensional soundstage. Precise separation of sound planes and sharp focus of the central image.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cb\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\" style=\"text-align: left;\"\u003e Ideal for:\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli class=\"p1\"\u003e medium-high and high quality line preamplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e driver stages and phase inverters\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e integrated amplifiers and power amplifiers that require stability and silence\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\" style=\"text-align: left;\"\u003e Particularly suitable for systems oriented towards transparency, neutrality and timbral correctness.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cb\u003e🎸 Use in Music Applications\u003c\/b\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\" style=\"text-align: left;\"\u003e Also appreciated in:\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli class=\"p1\"\u003e instrument amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e studio equipment\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e sensitive entry positions\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\" style=\"text-align: left;\"\u003e They offer clarity, control and balanced harmonic response, while maintaining silence and operational stability.\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003e🎯 Note for audiophiles and technicians\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli class=\"p1\"\u003e\n\n \u003cspan class=\"s1\"\u003eOriginal Telefunken production\u003c\/span\u003e \u003cb\u003e– Made in W. Germany\u003c\/b\u003e\n\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e Authentic \u003cspan class=\"s1\"\u003e\u003cb\u003eDiamond Bottom\u003c\/b\u003e\u003c\/span\u003e Caseback\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eSmooth Plates\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e NOS – New Old Stock\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\n\u003c\/li\u003e\n\n \u003cli class=\"p1\"\u003eTested and matched on \u003cspan class=\"s1\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e A model that represents the Telefunken school in its most classic form: precision, balance and reliability over time, in full Vacuum Tubes Treasures style.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eTest Results:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eValve tested on AMPLITREX AT-1000 Tube Tester:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 250V, Vg = -8.5V\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Gm = 2200 ; Ia = 10.5 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\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 2200 ; Ia = 9.4 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 2300 ; Ia = 9.2 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Low. Tested and approved for use in hi-fi, including phono stages and guitar amplifiers. Also suitable for V1.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3 style=\"text-align: left;\"\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eCondition:\u003c\/strong\u003e NOS - New Old Stock - Tested and in perfect working order. Comes in our custom box for optimal protection.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e Good – Lettering partially eroded, but still legible. Valve body in good condition. See photos for details.\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"text-align: left;\"\u003e\n\n\u003cli\u003e B ml 25 → B → Berlin - fr → December 1964 - 25 → Internal serial number\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp style=\"text-align: left;\"\u003e The codes indicate distinct production batches, while maintaining the same smooth-plate internal structure and authentic diamond bottom. Both tubes feature consistent construction and characteristics typical of Telefunken West Germany production.\u003c\/p\u003e\n\n\u003cp style=\"text-align: left;\"\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":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":56801002062172,"sku":"03438","price":134.5,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_5f8d6373-b857-45e0-87ac-9caca5ad2e59.jpg?v=1771843319","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12au7-ecc82-telefunken-nos-amplitrex-tested-smooth-plates-diamond-bottom-made-in-west-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}