{"product_id":"12ax7-ecc83-nos-telefunken-tested-pair-tubes-smooth-plates-diamond-bottom-western-germany-copia","title":"12AX7 ECC83 TELEFUNKEN Tested Pair Tubes – Smooth Plates Diamond Bottom Made in Germany","description":"\u003cp\u003e\u003cstrong\u003e12AX7 ( ECC83 ) TELEFUNKEN Smooth Plates Diamond \u0026lt;\u0026gt; Bottom Tested Pair Tubes Made in Germany '60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"831\" data-start=\"317\"\u003eThe \u003cstrong data-end=\"340\" data-start=\"320\"\u003e12AX7 TELEFUNKEN\u003c\/strong\u003e , in the prestigious \u003cstrong data-end=\"429\" data-start=\"369\"\u003eSmooth Plates version with diamond logo \u0026lt;\u0026gt; engraved on the bottom\u003c\/strong\u003e , represents one of the most refined and sought-after expressions in the history of European valve production.\u003cbr data-end=\"542\" data-start=\"539\"\u003eThis \u003cstrong data-end=\"571\" data-start=\"556\"\u003etested\u003c\/strong\u003e pair, produced in \u003cstrong data-end=\"618\" data-start=\"585\"\u003eGermany in the 60s\u003c\/strong\u003e , is distinguished by an extremely \u003cstrong data-end=\"687\" data-start=\"659\"\u003eclean, neutral and stable\u003c\/strong\u003e sound, which makes it an absolute reference for top-level hi-fi applications, recording studios and professional audio equipment.\u003c\/p\u003e\n\u003cp data-end=\"1054\" data-start=\"833\"\u003e\u003cstrong data-end=\"842\" data-start=\"833\"\u003eBass\u003c\/strong\u003e : Fast, clean, and articulate. Low frequencies are present with surgical precision, without exuberance or slowness. Ideal for systems requiring timbre rigor and immediate response in the low range.\u003c\/p\u003e\n\u003cp data-end=\"1355\" data-start=\"1056\"\u003e\u003cstrong data-end=\"1064\" data-start=\"1056\"\u003eMids\u003c\/strong\u003e : Extraordinarily transparent and neutral. Voices are centered, detailed, and natural, with a sober and faithful timbre. Acoustic instruments are rendered clearly, without any artificial coloration or emphasis. The midrange is this tube's undisputed strength.\u003c\/p\u003e\n\u003cp data-end=\"1582\" data-start=\"1357\"\u003e\u003cstrong data-end=\"1365\" data-start=\"1357\"\u003eHighs\u003c\/strong\u003e : extended, bright, and always under control. The upper end is airy, but never sharp or aggressive. The clarity is refined, contributing to the airiness of the soundstage without compromising listening comfort.\u003c\/p\u003e\n\u003cp data-end=\"1803\" data-start=\"1584\"\u003e\u003cstrong data-end=\"1596\" data-start=\"1584\"\u003eDynamics\u003c\/strong\u003e : Impeccable. Transient response is fast yet fluid, with an expressive naturalness that enhances every dynamic nuance. Even the most sudden excursions are handled with balance and coherence.\u003c\/p\u003e\n\u003cp data-end=\"2037\" data-start=\"1805\"\u003e\u003cstrong data-end=\"1819\" data-start=\"1805\"\u003eSoundstage\u003c\/strong\u003e : wide, deep, and perfectly defined. The stereo image is clear, stable, and well-focused, with very accurate separation of sound planes. The scene opens up realistically and controlled, without artifice.\u003c\/p\u003e\n\u003cp data-end=\"2325\" data-start=\"2039\"\u003eThe \u003cstrong data-end=\"2128\" data-start=\"2042\"\u003e12AX7 TELEFUNKEN Smooth Plates – Diamond Bottom – Made in Germany '60s\u003c\/strong\u003e , is a valve with an \u003cstrong data-end=\"2228\" data-start=\"2181\"\u003eanalytical, balanced and highly musical\u003c\/strong\u003e character, ideal for those who want \u003cstrong data-end=\"2324\" data-start=\"2257\"\u003emaximum neutrality without sacrificing detail and micro-dynamics\u003c\/strong\u003e .\u003c\/p\u003e\n\u003cp data-end=\"2387\" data-start=\"2327\"\u003e🎧 \u003cstrong data-end=\"2387\" data-start=\"2330\"\u003eUse in Headphone Amplifiers and Hi-Fi Driver Stages\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"2712\" data-start=\"2389\"\u003ePerfect for high-end preamplifiers, tube DACs, and reference headphone amplifiers. It offers transparent, quiet, and detailed performance, ideal with headphones like \u003cstrong data-end=\"2584\" data-start=\"2563\"\u003ethe Sennheiser HD800S\u003c\/strong\u003e , \u003cstrong data-end=\"2602\" data-start=\"2586\"\u003eFocal Utopia\u003c\/strong\u003e , \u003cstrong data-end=\"2623\" data-start=\"2604\"\u003eBeyerdynamic T1\u003c\/strong\u003e , or \u003cstrong data-end=\"2641\" data-start=\"2627\"\u003eZMF Vérité\u003c\/strong\u003e . The spatial reconstruction and harmonic response are benchmark.\u003c\/p\u003e\n\u003cp data-end=\"2762\" data-start=\"2714\"\u003e🎸 \u003cstrong data-end=\"2762\" data-start=\"2717\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"3016\" data-start=\"2764\"\u003eHighly prized in music for its tonal consistency and lack of harshness. Used in vintage Fender, Vox AC30, and Marshall Plexi amps, it delivers a defined, fluid, and harmonically rich sound, both clean and in controlled overdrive.\u003c\/p\u003e\n\u003cp data-end=\"3244\" data-start=\"3018\"\u003e🎯 \u003cstrong data-end=\"3053\" data-start=\"3021\"\u003eNote for audiophiles and technicians\u003c\/strong\u003e\u003cbr data-end=\"3056\" data-start=\"3053\"\u003eOne of the most neutral and musical valves ever made, recommended for those who want \u003cstrong data-end=\"3210\" data-start=\"3141\"\u003eabsolute transparency, dynamic balance and tonal refinement\u003c\/strong\u003e , without introducing character.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVoltage Test:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eVa = 250V, Vg = -2V \u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003eGm = 1600 ; Ia = 1.2 mA \u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eSTRONG \/ GOOD\u003c\/p\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 : Gm = 1500; Ia = 0.9 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 1400; Ia = 0.8mA\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 : Gm = 1400; Ia = 0.7 mA\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 1300; Ia = 0.6 mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\u003c\/div\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 Noise \u0026amp; Microphonics – Tested and compliant for use in hi-fi systems and guitar amplifiers.\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 \u003cspan\u003eVery good – Clearly legible writing with minor signs of wear, no obvious defects. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e Unreadable – Telefunken production, identifiable by construction features. 1960s\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 tubes are different – the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" 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":54678797713756,"sku":"02956","price":21300.0,"currency_code":"ALL","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_e797a2bf-d446-41cc-8380-8054e5377d53.jpg?v=1749048179","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/12ax7-ecc83-nos-telefunken-tested-pair-tubes-smooth-plates-diamond-bottom-western-germany-copia","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}