{"product_id":"12ax7-ecc83-ge-short-gray-plates-halo-getter-tested-tube-made-in-usa","title":"12AX7 \/ ECC83 GE Short Gray Plates Halo Getter Tested Tube Made in USA","description":"\u003ch3 class=\"p1\"\u003e\u003cb\u003e12AX7 \/ ECC83 GE – Short Gray Plates – Halo Getter – Made in USA\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cb\u003eAMPLITREX Tested – STRONG – Low Noise \u0026amp; Microphonics – Vintage American General Electric Production\u003c\/b\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTube tested on\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eAMPLITREX AT-1000\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eTube Tester:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e\u003cspan\u003e Va = 250V ; Vg = -2V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003e100% Average:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 1600 ; Ia = 1.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e STRONG\u003c\/li\u003e\n\n\n\u003c\/ul\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\u003cspan\u003e \u003c\/span\u003eGm = 1400 ; Ia = 0.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm =\u003cspan\u003e \u003c\/span\u003e1430 ; Ia = 0.8 mA\u003c\/li\u003e\n\n\n\u003c\/ul\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. Tested and suitable for use in hi-fi and guitar amplifiers, even in V1.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Excellent - The sections are consistent and well-aligned, making the tube suitable even for use as a phase inverter in hi-fi and instrument applications.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Strong – Strong and even 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 None.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003ch3 class=\"p1\"\u003e\u003cb\u003eDescription\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eSelected vintage specimen of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 General Electric\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in the United States and dating approximately to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1970s\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e based on its construction features. The tube features the classic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Gray Plates with Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e configuration, representative of American GE production from this period. An authentic vintage tube, particularly interesting for audiophiles and musicians seeking original components, carefully verified and with documented electrical characteristics.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe measurements performed with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e show a transconductance of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1400 and 1430 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in the respective sections, with an average of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1415 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the nominal reference of 1600. The anode currents are perfectly uniform, equal to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.8 mA for both sections\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, compared to the reference of 1.2 mA. Although the values are lower than the nominal references, the tube features an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexcellent internal balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with a difference of just 2.1% in transconductance and identical anode currents. A particularly appreciable symmetry in applications requiring a good balance between the two sections.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe specimen passed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e48 hours of burn-in and stability testing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, maintaining a strong and even emission, without fluctuations, short circuits, or presence of gas. The tests also confirmed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise and microphonics levels\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making the tube suitable even for sensitive audio stages, including the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV1 position in guitar amplifiers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e12AX7 \/ ECC83 General Electric\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e tubes find application in hi-fi preamplifiers, compatible phono stages, and guitar amplifiers, both in the input stages and as drivers or phase inverters. American GE production is traditionally appreciated for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eclear, dynamic, and balanced\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with good definition and expressive naturalness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe value of this specimen lies in the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eauthenticity of the American General Electric production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, in the excellent electrical balance between the sections, and in the low-noise selection. The \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e188\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e marking identifies General Electric, while the dating code, not completely legible, does not allow us to establish the exact year of production. The good aesthetic condition, with partially preserved screen printing, completes the vintage character of an \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eoriginal GE 12AX7 \/ ECC83\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, tested and selected for those who want a vintage tube with documented performance and verified stability.\u003c\/span\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\u003cspan\u003e Vintage Tubes - Tested and perfectly functional. Supplied in our custom box for optimal protection. \u003c\/span\u003e \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 – Lettering 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 ?? - 188 → two-letter code → Code not decipherable. Production attributable approximately to the 1970s based on construction features → General Electric Company, Syracuse 1, N. Y.\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 longevity\" 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":"GE","offers":[{"title":"Default Title","offer_id":59757306446172,"sku":"03915","price":449.0,"currency_code":"SEK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/10_34f01e48-fb25-49c2-8ccc-8afcdbbd9ac8.jpg?v=1793805167","url":"https:\/\/vacuumtubestreasures.com\/en-se\/products\/12ax7-ecc83-ge-short-gray-plates-halo-getter-tested-tube-made-in-usa","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}