{"product_id":"ecc83-12ax7-telefunken-matched-pair-ribbed-plates-diamond-bottom-tube-made-in-germany","title":"ECC83 \/ 12AX7 TELEFUNKEN Matched Pair Ribbed Plates Diamond Bottom Tube Made in GERMANY","description":"\u003cp\u003e\u003cstrong\u003eECC83 \/ 12AX7 GAP\/R COMPUTOR by TELEFUNKEN Tubes - Ribbed Plates Diamond \u0026lt;\u0026gt; Bottom Made in Germany '60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e–\u003cmeta charset=\"utf-8\"\u003eMatched Pair – Low Noise \u0026amp; Microphonics – Vintage \u003cmeta charset=\"utf-8\"\u003eTELEFUNKEN Production\u003c\/strong\u003e\u003c\/p\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 \u003c\/span\u003e\u003c\/strong\u003eVa = 250V, Vg = -2V\u003cstrong\u003e\u003cbr\u003eAverage 100%:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eGm = 1600 ; Ia = 1.2 mA\u003cstrong\u003e\u003cbr\u003eTEST RESULT:\u003c\/strong\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVERY\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eSTRONG\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTube 1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 1700 ; Ia = 1.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 1500 ; Ia = 0.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube 2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1\u003c\/strong\u003e: Gm = 1800 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 1600 ; Ia = 1.1 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\u003eBurn-in \/ Stability Test:\u003c\/strong\u003e 48h – OK\u003c\/span\u003e\u003c\/li\u003e\n\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\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Good. 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\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003ePremium \u003cstrong\u003eMatched Pair of ECC83 \/ 12AX7 GAP\/R COMPUTOR produced by TELEFUNKEN\u003c\/strong\u003e, authentic German production \u003cstrong\u003eMade in Germany from 1962\u003c\/strong\u003e, characterized by the sought-after \u003cstrong\u003eRibbed Plates\u003c\/strong\u003e construction and the unmistakable \u003cstrong\u003eDiamond \u0026lt;\u0026gt; Bottom\u003c\/strong\u003e, the diamond embossed in the glass between the pins that identifies original Telefunken productions.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eGAP\/R COMPUTOR\u003c\/strong\u003e branding makes the pair particularly interesting, but the internal construction and the distinctive diamond on the bottom confirm the authentic \u003cstrong\u003eTELEFUNKEN\u003c\/strong\u003e origin. The code \u003cstrong\u003eGI\u003c\/strong\u003e places production in \u003cstrong\u003eDecember 1962\u003c\/strong\u003e, a particularly valued period for German ECC83s intended for audio and professional applications.\u003c\/p\u003e\n\u003cp\u003eThe tubes have been carefully tested and selected in our laboratory using the \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eVERY STRONG\u003c\/strong\u003e classification. The transconductance values of the four sections range between \u003cstrong\u003e1500 and 1800\u003c\/strong\u003e, with anodic currents between \u003cstrong\u003e0.8 and 1.2 mA\u003c\/strong\u003e, showing good overall balance and excellent consistency between the two units.\u003c\/p\u003e\n\u003cp\u003eThe pair also passed a \u003cstrong\u003e48-hour Burn-in \/ Stability Test\u003c\/strong\u003e and was selected for \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e, making it particularly suitable for hi-fi systems and guitar amplifiers. Emission was found to be very strong and stable, with no fluctuations, shorts, gas, or detected anomalies.\u003c\/p\u003e\n\u003cp\u003eSonically, the \u003cstrong\u003eTelefunken ECC83 Ribbed Plates\u003c\/strong\u003e are particularly appreciated for their transparency, definition, and precision, with a very natural midrange, controlled bass, and open, detailed high frequencies without excessive aggression. The soundstage is orderly, focused, and rich in detail, characteristics that have made these productions a benchmark among vintage European ECC83s.\u003c\/p\u003e\n\u003cp\u003eIdeal for \u003cstrong\u003ehi-fi preamplifiers, integrated amplifiers, line stages, compatible phono stages, tube DACs, and guitar amplifiers\u003c\/strong\u003e that use \u003cstrong\u003eECC83 \/ 12AX7\u003c\/strong\u003e. The good balance of the sections allows for very versatile use in audio and instrumental applications, in all cases where absolute symmetry between the two triodes is not required.\u003c\/p\u003e\n\u003cp\u003eThe tubes are \u003cstrong\u003eVintage\u003c\/strong\u003e, carefully tested, and fully functional. Aesthetic conditions are \u003cstrong\u003egood\u003c\/strong\u003e, with partially eroded but still legible markings and a well-preserved tube body. They are supplied in our custom boxes for optimal protection.\u003c\/p\u003e\n\u003cp\u003eA premium \u003cstrong\u003eMatched Pair of GAP\/R COMPUTOR ECC83 \/ 12AX7 by TELEFUNKEN Ribbed Plates Diamond \u0026lt;\u0026gt; Bottom from 1962\u003c\/strong\u003e, genuinely tested, selected, and matched by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, ideal for those seeking authentic vintage German Telefunken, very strong and selected for \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e.\u003c\/p\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\u003eFully 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 eroded, 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 GI – TELEFUNKEN production December 1962 - Diamond embossed in the glass between the pins.\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":58903156719964,"sku":"03774","price":229.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_d40a3024-d6d3-428f-8c75-d8cef269f2a2.jpg?v=1788285551","url":"https:\/\/vacuumtubestreasures.com\/en-gr\/products\/ecc83-12ax7-telefunken-matched-pair-ribbed-plates-diamond-bottom-tube-made-in-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}