{"product_id":"12ax7-ecc83-ge-nos-short-gray-plates-halo-getter-tested-tube-made-in-usa-1","title":"12AX7 \/ ECC83 GE NOS Short Gray Plates Halo Getter Tested Tube Made in USA","description":"\u003ch3 class=\"p1\"\u003e\u003cb\u003e12AX7 \/ ECC83 GE NOS – 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 – VERY 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\u003cspan\u003e \u003c\/span\u003eVERY 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 = 1700 ; Ia = 1.2 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\u003e1800 ; Ia = 1.3 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, including in V1.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-matched, making the tube suitable 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 Excellent – Very strong and stable emission, without fluctuations.\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 specimen \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS 12AX7 \/ ECC83 General Electric\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, produced in the United States in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eJuly 1975\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, an authentic example of GE American thermionic production. The tube features the characteristic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eShort Gray Plates with Halo Getter\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e construction, accompanied by the well-preserved original General Electric screen printing. A configuration appreciated by audiophiles and musicians seeking original American vintage tubes, with documented electrical characteristics and the typical construction quality of GE production.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe measurements performed with the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmplitrex AT-1000\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e highlight particularly solid performance. The transconductance of the two sections reaches \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1700 and 1800 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with an average of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1750 µmhos\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, approximately 9% above the nominal reference of 1600. The anode currents are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1.2 and 1.3 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e respectively, with an average of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e1.25 mA\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, also above the reference of 1.2 mA. These results confirm a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003every strong emission and very good internal balance\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with consistent electrical characteristics between the two sections.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe tube 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 constant emission, without fluctuations, short circuits, or the presence of gas. The tests also confirmed \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elow noise and microphonics\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, making the specimen suitable even for the most sensitive amplification stages, including the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV1 position in guitar amplifiers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, where silence is particularly important.\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. GE American production is traditionally appreciated for a musical presentation generally described as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eopen, dynamic, and well-defined\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with good articulation, clarity, and balanced reproduction, characteristics sought after in both hi-fi listening and instrument amplification.\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 1975 General Electric production\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, identified by the original \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eKJ – 188\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e code, its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eNOS\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e condition, and electrical performance exceeding the nominal references. The well-preserved screen printing, very good cosmetic condition, and low-microphonics selection complete a particularly interesting vintage tube. An authentic \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAmerican GE 12AX7 \/ ECC83\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, carefully tested and selected, intended for enthusiasts who desire historic construction quality, verified stability, and documented electrical characteristics.\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 NOS - New Old Stock - Tested and working - 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\u003eCosmetic condition:\u003c\/strong\u003e\u003cspan\u003e Very Good – Markings clearly legible 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 KJ - 188 → two-letter code → July 1975 production → 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":59756880527708,"sku":"03914","price":54.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_01ef665e-c219-40f7-b1b0-2ed7f8e0e3f0.jpg?v=1793802362","url":"https:\/\/vacuumtubestreasures.com\/en-be\/products\/12ax7-ecc83-ge-nos-short-gray-plates-halo-getter-tested-tube-made-in-usa-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}