{"product_id":"12ax7-ecc83-rca-long-gray-plates-square-tilt-getter-made-in-usa-50s","title":"12AX7 \/ ECC83 RCA Long Gray Plates Square Tilt Getter Made in USA '50s","description":"\u003cp class=\"p1\"\u003e \u003cb\u003e12AX7 \/ ECC83 RCA – Long Gray Plates – Square Tilt Getter – Made in USA '50s\u003c\/b\u003e\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e \u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/p\u003e\n\n\u003ch3\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\n\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This original RCA 12AX7 \/ ECC83, made in the United States in the 1950s, represents one of the most sought-after versions of the famous American double triode, appreciated for its build quality and its distinctive sonic character.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The internal structure highlights elements typical of the best RCA productions of the time:\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\u003eSquare Tilt Getter\u003c\/b\u003e\n\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e robust and precise internal construction\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s2\"\u003e\u003cb\u003esquare tilt getter\u003c\/b\u003e\u003c\/span\u003e is a characteristic configuration of the first productions, today particularly appreciated for its vacuum stability and longevity.\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eThe valve has been tested in our laboratory with \u003cspan class=\"s2\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e , with \u003cspan class=\"s2\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, and \u003cspan class=\"s2\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e verified, making it suitable even for sensitive positions in the circuit.\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 This RCA 50's configuration offers a typically \u003cspan class=\"s1\"\u003e\u003cb\u003ewarm, full and three-dimensional\u003c\/b\u003e\u003c\/span\u003e sound, with an extremely natural musical presentation.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Deep and rounded, with excellent structure and body. Never intrusive, but always well controlled.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eMids:\u003c\/b\u003e The real strength: rich, textured, and incredibly expressive. Vocals are present, credible, and nuanced.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Sweet and refined, never aggressive. Excellent extension with a velvety performance typical of the best vintage RCA productions.\u003c\/p\u003e\n\n \u003cp class=\"p3\"\u003e\u003cb\u003eDynamics:\u003c\/b\u003e Fluid and natural, with a musical response that prioritizes coherence and musicality over artificial impact.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Wide and well-layered, with excellent instrument separation and realistic depth.\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 Ideal for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e tube preamplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e vintage and modern integrated amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e phono stages (due to low noise)\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e quality buffer and line stage\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e Perfect for systems requiring \u003cspan class=\"s2\"\u003e\u003cb\u003emusicality, naturalness and realistic harmonic reconstruction\u003c\/b\u003e\u003c\/span\u003e , with a typically “American” sound signature.\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 Also highly appreciated in the instrumental field for:\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e guitar amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e vintage organs and instruments\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003cp class=\"p1\"\u003e It offers a \u003cspan class=\"s2\"\u003e\u003cb\u003ewarm, progressive and musical\u003c\/b\u003e\u003c\/span\u003e response, with a soft and controlled saturation, ideal for those looking for character without harshness.\u003c\/p\u003e\n\n \u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯\u003c\/span\u003e Note for audiophiles\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp class=\"p1\"\u003e This 50's RCA represents a very interesting choice for those who want a \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 with authentic vintage character\u003c\/b\u003e\u003c\/span\u003e , solid construction and high performance.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The \u003cspan class=\"s1\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e test on Amplitrex and the \u003cspan class=\"s1\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e verification ensure stable and reliable operation, making it suitable even for critical positions in the circuit.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e A valve that combines \u003cspan class=\"s1\"\u003e\u003cb\u003ehistory, construction and musicality\u003c\/b\u003e\u003c\/span\u003e , designed for those seeking not only performance, but a true listening experience.\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 VERY STRONG\u003c\/p\u003e\n\n\u003cp\u003e \u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\n\u003cli\u003e \n\u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm = 1600; Ia = 0.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm =\u003cmeta charset=\"utf-8\"\u003e 1800 ; Ia = 1.0 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\n\n \u003cstrong\u003eBalance:\u003c\/strong\u003e The sections present a coherent balance, fully compatible with use in hi-fi and musical amplifiers, in all applications where absolute symmetry between the sections is not required.\u003c\/li\u003e\n\n\u003cli\u003e \u003cspan\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e Excellent – ​​Very strong and stable output, no fluctuations.\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\u003eFair – Writing completely faded. 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 Unreadable, identifiable by construction features. 1950s\u003cbr\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\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\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":57028996301148,"sku":"03473","price":64.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_5f54e431-aae5-4882-b13b-a1babfc4663f.jpg?v=1773740431","url":"https:\/\/vacuumtubestreasures.com\/en-hr\/products\/12ax7-ecc83-rca-long-gray-plates-square-tilt-getter-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}