{"product_id":"12ax7-ecc83-telefunken-tested-tube-ribbed-plates-diamond-bottom-made-in-germany-1","title":"12AX7 \/ ECC83 NOS TELEFUNKEN Tested Tube - Ribbed Plates Diamond Bottom Made in Germany","description":"\u003cp\u003e\u003cstrong\u003e12AX7 (ECC83) NOS TELEFUNKEN \u003cmeta charset=\"utf-8\"\u003eTested Tube - Ribbed Plates Diamond \u0026lt;\u0026gt; Bottom Made in Germany '60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – Balanced Sections – Low Noise \u0026amp; Microphonics – Vintage \u003cmeta charset=\"utf-8\"\u003eTELEFUNKEN Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 TELEFUNKEN NOS\u003c\/b\u003e\u003c\/span\u003e, produced in Germany in the 1960s and identifiable by the unmistakable \u003cspan class=\"s1\"\u003e\u003cb\u003eDiamond \u0026lt;\u0026gt; mark printed in the glass at the base\u003c\/b\u003e\u003c\/span\u003e, represents one of the most famous and sought-after signal tubes ever made.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe construction with \u003cspan class=\"s1\"\u003e\u003cb\u003eRibbed Plates\u003c\/b\u003e\u003c\/span\u003e identifies the classic configuration of TELEFUNKEN production during the German company's period of maximum industrial maturity, appreciated worldwide for construction precision, exceptional longevity, and extraordinary tonal neutrality.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eTELEFUNKEN ECC83 Diamond Bottom tubes are still considered an absolute benchmark for those seeking transparency, detail, and musical coherence, qualities that have made them key components in numerous European hi-fi, broadcast, and professional equipment.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThis tube has been carefully tested using an \u003cspan class=\"s1\"\u003e\u003cb\u003eAMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e, proving to be \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e, quiet, and perfectly stable.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eAesthetically, it is in \u003cspan class=\"s1\"\u003e\u003cb\u003egood overall condition\u003c\/b\u003e\u003c\/span\u003e. The original markings are partially worn by time but still recognizable, while the tube body and internal structure remain well preserved, as shown in the photographs.\u003c\/p\u003e\n\u003ch3 data-end=\"741\" data-start=\"713\"\u003e\u003cstrong data-end=\"741\" data-start=\"715\"\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eTELEFUNKEN Ribbed Plates are renowned for an extremely balanced and refined sound profile.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eUnlike other vintage ECC83s that tend to characterize the sound more, these TELEFUNKENs aim for maximum fidelity and transparency.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eBass\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe bass is precise, controlled, and articulate, with excellent definition of musical lines and no artificial bloat.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eMids\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe midrange is extremely clean and natural, with a particularly credible and realistic reproduction of voices.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eHighs\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe highs are one of the strong points of this production: extended, airy, and detailed, without harshness or aggressiveness.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"s1\"\u003e\u003cb\u003eDynamics\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eDynamic response is fast and accurate, with excellent ability to follow the finest musical variations.\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, stable, and well-focused, with excellent separation between instruments and performers.\u003c\/p\u003e\n\u003ch3 data-end=\"2281\" data-start=\"1981\"\u003e\u003cstrong\u003e🎧 Use in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis TELEFUNKEN ECC83 is particularly suitable for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eHigh-end tube preamplifiers\u003c\/li\u003e\n\n\u003cli\u003eMM and MC phono stages\u003c\/li\u003e\n\n\u003cli\u003eIntegrated hi-fi amplifiers\u003c\/li\u003e\n\n\u003cli\u003eDACs and tube audio equipment\u003c\/li\u003e\n\n\u003cli\u003eProfessional and broadcast equipment\u003c\/li\u003e\n\n\u003cli\u003eRestorations of vintage European 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 makes it particularly interesting even for the most critical positions in the circuit.\u003c\/p\u003e\n\u003ch3 data-end=\"2560\" data-start=\"2283\"\u003e\u003cstrong\u003e🎸 Use in Musical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eTELEFUNKEN Diamond Bottom tubes are also highly valued in music for those seeking:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eGreat note definition\u003c\/li\u003e\n\n\u003cli\u003eExcellent intelligibility\u003c\/li\u003e\n\n\u003cli\u003eFast and precise dynamics\u003c\/li\u003e\n\n\u003cli\u003eExtremely linear response\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eParticularly interesting in boutique amplifiers, recording, and professional applications where transparency and detail are priorities.\u003c\/p\u003e\n\u003ch3 data-end=\"3066\" data-start=\"2562\"\u003e\u003cstrong\u003e🎯 Note for Audiophiles\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eAuthentic \u003cspan class=\"s1\"\u003e\u003cb\u003eTELEFUNKEN Diamond Bottom Made in Germany\u003c\/b\u003e\u003c\/span\u003e tubes represent one of the most sought-after ECC83s in the global vintage tube market.\u003c\/p\u003e\n\u003cp class=\"p2\"\u003eIdentification via:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003eOriginal Diamond \u0026lt;\u0026gt; Bottom\u003c\/li\u003e\n\n\u003cli\u003eGerman production from the 1960s\u003c\/li\u003e\n\n\u003cli\u003eRibbed Plates\u003c\/li\u003e\n\n\u003cli\u003eAuthentic TELEFUNKEN construction\u003c\/li\u003e\n\n\u003cli\u003eVERY STRONG AMPLITREX test\u003c\/li\u003e\n\n\u003cli\u003eLow Noise \u0026amp; Microphonics\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003emakes this example particularly interesting for both high-level audio use and collecting.\u003c\/p\u003e\n\u003cp class=\"p4\"\u003eThis tube still maintains very high electrical performance, exceeding the nominal average required for quality hi-fi use.\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: \u003c\/strong\u003eVa = 250V, Vg = -2V\u003cstrong\u003e\u003cbr\u003eAverage 100%: \u003c\/strong\u003eGm = 1600 ; Ia = 1.2 mA\u003cstrong\u003e\u003cbr\u003eTEST RESULT: \u003c\/strong\u003eVERY\u003cstrong\u003e \u003c\/strong\u003eSTRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube :\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 1600 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 1500 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\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 Noise \u0026amp; Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections show 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 NOS - New Old Stock - Tested and working - 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\u003cspan\u003e Good – Markings partially worn, but still legible. Tube body in good condition. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e absent – TELEFUNKEN production, identifiable by construction characteristics. 1960s\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":"TELEFUNKEN","offers":[{"title":"Default Title","offer_id":57775051866460,"sku":"03622","price":235.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_9a718477-f2ec-43dc-b5bc-d22131727450.jpg?v=1780311566","url":"https:\/\/vacuumtubestreasures.com\/en-au\/products\/12ax7-ecc83-telefunken-tested-tube-ribbed-plates-diamond-bottom-made-in-germany-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}