{"product_id":"12ax7-ecc83-wurlitzer-by-ge-matched-pair-long-gray-plates-halo-getter-made-in-usa-63","title":"12AX7 \/ ECC83 Wurlitzer by GE Matched Pair Long Gray Plates Halo Getter Made in USA '63","description":"\u003cp\u003e \u003cstrong\u003e12AX7 \/ ECC83 Wurlitzer by GE Matched Pair Long Gray Plates Halo Getter Made in USA '63\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This \u003cspan class=\"s1\"\u003e\u003cb\u003ematched pair of Wurlitzer-branded 12AX7\/ECC83s\u003c\/b\u003e\u003c\/span\u003e , manufactured by \u003cspan class=\"s1\"\u003e\u003cb\u003eGeneral Electric in the USA in 1963\u003c\/b\u003e\u003c\/span\u003e , represents a selection of American signal tubes originally intended for professional applications.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s1\"\u003e\u003cb\u003eWurlitzer\u003c\/b\u003e\u003c\/span\u003e brand, known for high-quality musical instruments and jukeboxes, relied on suppliers like GE for select, reliable tubes. The internal construction was typical of \u003cspan class=\"s1\"\u003e\u003cb\u003eGeneral Electric\u003c\/b\u003e\u003c\/span\u003e of the time, synonymous with solidity and production consistency.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The structure includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eLong Gray Plates\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eHalo Getter\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e robust and precise construction typical of the GE of the 1960s\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp class=\"p1\"\u003eThe tubes have been \u003cspan class=\"s1\"\u003e\u003cb\u003ecarefully selected as a Matched Pair\u003c\/b\u003e\u003c\/span\u003e and tested in our laboratory on \u003cspan class=\"s1\"\u003e\u003cb\u003ean AMPLITREX AT-1000\u003c\/b\u003e\u003c\/span\u003e , with a \u003cspan class=\"s1\"\u003e\u003cb\u003eSTRONG\u003c\/b\u003e\u003c\/span\u003e result. They have also been found to be \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e , making them suitable even for sensitive circuit positions.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s1\"\u003e\u003cb\u003eGE long plates\u003c\/b\u003e\u003c\/span\u003e offer a balanced sonic presentation, with a slightly more open and relaxed character than the short plate versions.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Well extended and controlled. The low range is solid and articulate, with good depth and stability.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eMids:\u003c\/b\u003e Clear and natural. Vocals emerge with good presence and definition, while acoustic instruments maintain a balanced harmonic reproduction.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Open and airy. The top end is well-extended and clean, with a fine grain that promotes good detail readability.\u003c\/p\u003e\n\n \u003cp class=\"p3\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e Responsive and linear. Dynamic changes are reproduced accurately and naturally.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Wide and well-organized soundstage, with good instrument separation and a stable presentation.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧\u003c\/span\u003e Use in Hi-Fi Amplifiers\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 GE long plates\u003c\/b\u003e\u003c\/span\u003e are particularly suitable for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003etube preamplifiers\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003ephono stages\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eamplifier drivers\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e vintage and modern hi-fi equipment\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p4\"\u003e \u003cspan class=\"s3\"\u003eThe combination of\u003c\/span\u003e \u003cb\u003elow noise and low microphonics\u003c\/b\u003e \u003cspan class=\"s3\"\u003emakes them suitable even for\u003c\/span\u003e \u003cb\u003ecritical positions such as V1\u003c\/b\u003e \u003cspan class=\"s3\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸\u003c\/span\u003e Use in Music Applications\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e These tubes are also popular in musical instrument amplifiers for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e balanced dynamic response\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e good signal definition\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e stable behavior over time\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n \u003cp class=\"p1\"\u003eFeatures that make them versatile for both studio and live use.\u003c\/p\u003e\n\n\u003ch3 class=\"p3\"\u003e \u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003c\/span\u003e Note for audiophiles\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eWurlitzer by General Electric – Made in USA\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eYear of production: 1963\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eLong Gray Plates – Halo Getter\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eMatched Pair selected\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eAMPLITREX AT-1000 Tested\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eSTRONG Test\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e \u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p3\"\u003e \u003cspan class=\"s2\"\u003eA\u003c\/span\u003e \u003cb\u003eselect pair of 12AX7 GE 1960s\u003c\/b\u003e \u003cspan class=\"s2\"\u003e, branded Wurlitzer, combining\u003c\/span\u003e \u003cb\u003ereliability, silence and balanced musicality\u003c\/b\u003e \u003cspan class=\"s2\"\u003e, ideal for hi-fi and musical applications in true\u003c\/span\u003e \u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e style \u003cspan class=\"s2\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eTest Results\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp\u003e \u003cstrong\u003eTested on AMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003c\/p\u003e\n\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 STRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 1\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm = 1400; Ia = 0.7 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm =\u003cmeta charset=\"utf-8\"\u003e 1400 ; Ia = 0.7 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve 2\u003c\/strong\u003e :\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm =\u003cmeta charset=\"utf-8\"\u003e 1400 ; Ia = 0.8 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\n\u003cdiv\u003e\n\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/div\u003e\n\n\u003cdiv\u003e \u003cstrong\u003eAdditional Tests Performed:\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cul\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\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Very Good – Strong, consistent output, suitable for any application.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003e \u003cstrong\u003eConditions:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eCondition:\u003c\/strong\u003e Vintage tubes - Tested and in perfect working order. Shipped 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\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eGood – Lettering partially eroded, but still legible. Valve 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\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e\n\n \u003cspan\u003e63-22 188 → RMA\/EIA Open Date Code → manufactured week 22, 1963 - 188 → General Electric Company, Syracuse 1, NY\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"GE","offers":[{"title":"Default Title","offer_id":57026442068316,"sku":"03471","price":722.0,"currency_code":"SEK","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_3c674173-f51e-40a9-a82d-8ce1da5a9b16.jpg?v=1773736136","url":"https:\/\/vacuumtubestreasures.com\/en-se\/products\/12ax7-ecc83-wurlitzer-by-ge-matched-pair-long-gray-plates-halo-getter-made-in-usa-63","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}