{"product_id":"ecc83-12ax7-telefunken-smooth-plates-diamond-bottom-tube-made-in-germany","title":"ECC83 \/ 12AX7 TELEFUNKEN Smooth Plates Diamond Bottom Tube Made in GERMANY","description":"\u003cp\u003e\u003cstrong\u003eECC83 \/ 12AX7 GAP\/R COMPUTOR by TELEFUNKEN \u003cmeta charset=\"utf-8\"\u003eTested Tube - Smooth Plates Diamond \u0026lt;\u0026gt; Bottom Made in Germany '60s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested – 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\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 = 1400 ; Ia = 0.9 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = 1300 ; Ia = 0.7 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 The sections are not perfectly aligned. The tube is suitable for use in non-critical hi-fi stages (input or driver) and in guitar amplifiers. Not suitable as a phase inverter or in applications requiring strict balance between sections.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Good Emission – Good and regular emission, suitable for any application\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eShort Circuits 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\u003eECC83 \/ 12AX7 GAP\/R COMPUTOR produced by TELEFUNKEN\u003c\/strong\u003e, an authentic German production from \u003cstrong\u003e1963\u003c\/strong\u003e, featuring the renowned \u003cstrong\u003eSmooth Plates\u003c\/strong\u003e construction and the unmistakable \u003cstrong\u003eDiamond \u0026lt;\u0026gt; Bottom\u003c\/strong\u003e, the diamond impressed in the glass between the pins that identifies original Telefunken Made in Germany productions.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eGAP\/R COMPUTOR\u003c\/strong\u003e marking makes this specimen particularly interesting: behind the trade name, we find a true \u003cstrong\u003eTelefunken ECC83\u003c\/strong\u003e, with the refined Smooth Plates construction that has become one of the most sought after among vintage European tube enthusiasts. The \u003cstrong\u003eHN\u003c\/strong\u003e code dates the production to \u003cstrong\u003eMarch 1963\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe tube has been accurately tested in our laboratory using an \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eSTRONG\u003c\/strong\u003e classification. The two sections measured \u003cstrong\u003eGm 1400 \/ Ia 0.9 mA\u003c\/strong\u003e and \u003cstrong\u003eGm 1300 \/ Ia 0.7 mA\u003c\/strong\u003e respectively, with good and regular emission. A \u003cstrong\u003e48-hour Burn-in \/ Stability Test\u003c\/strong\u003e was also performed, which passed successfully, along with \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e selection. No short circuits, gas, or anomalies were detected.\u003c\/p\u003e\n\u003cp\u003eSonically, \u003cstrong\u003eTelefunken ECC83 Smooth Plates\u003c\/strong\u003e are historically appreciated for their great transparency, precision, and ability to reproduce detail without losing naturalness. The mid-range is defined and articulate, the extremes are clean and controlled, and the overall presentation maintains the balance and sophistication typically associated with the best vintage Telefunken productions.\u003c\/p\u003e\n\u003cp\u003eSuitable for \u003cstrong\u003ehi-fi preamplifiers, integrated amplifiers, line stages, and guitar amplifiers\u003c\/strong\u003e compatible with \u003cstrong\u003eECC83 \/ 12AX7\u003c\/strong\u003e. The \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e selection allows for its use in input stages; however, since the two sections are not perfectly aligned, it is not the ideal choice as a \u003cstrong\u003ephase inverter\u003c\/strong\u003e or in applications requiring particularly rigorous balancing.\u003c\/p\u003e\n\u003cp\u003eThe tube is \u003cstrong\u003eVintage\u003c\/strong\u003e, accurately tested and perfectly working, with \u003cstrong\u003every good\u003c\/strong\u003e aesthetic conditions and legible markings. It comes in our custom box for optimal protection.\u003c\/p\u003e\n\u003cp\u003eA fascinating \u003cstrong\u003eGAP\/R COMPUTOR ECC83 \/ 12AX7 by TELEFUNKEN Smooth Plates Diamond \u0026lt;\u0026gt; Bottom from 1963\u003c\/strong\u003e, genuinely tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, ideal for those who desire authentic German Telefunken construction with \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e at a professional selection level.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eConditions:\u003c\/strong\u003e Vintage Tubes - Tested and perfectly 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\u003ePerfectly operational.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAesthetic conditions:\u003c\/strong\u003e\u003cspan\u003e Very Good – Legible markings with slight signs of age. 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 HN – TELEFUNKEN production March 1963 - Diamond impressed 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=\"Perché le nostre valvole sono diverse – il protocollo VTT che migliora suono, affidabilità e durata\" 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":58902112010588,"sku":"03773","price":19000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/9_5961efcd-bd3a-4978-b76c-c5ef78460ce5.jpg?v=1788282883","url":"https:\/\/vacuumtubestreasures.com\/en-jp\/products\/ecc83-12ax7-telefunken-smooth-plates-diamond-bottom-tube-made-in-germany","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}