{"product_id":"12ax7-ecc83-rca-long-gray-plates-square-getter-made-in-usa-50s","title":"12AX7 \/ ECC83 RCA Long Gray Plates Square Getter Tube - Balanced - Made in USA '50s","description":"\u003cp class=\"p1\"\u003e\u003cb\u003e12AX7 \/ ECC83 RCA – Long Gray Plates – Square Getter – Made in USA ‘50s\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cb\u003eAMPLITREX Tested – VERY STRONG – Low Noise \u0026amp; Microphonics \u003cmeta charset=\"utf-8\"\u003e– \u003c\/b\u003e\u003cstrong\u003eVintage American RCA Production\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis original 12AX7 \/ ECC83 RCA, produced in the USA in the 1950s, represents one of the most sought-after versions of the famous American dual triode, prized for its build quality and distinctive sonic character.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe internal structure showcases elements typical of RCA's best productions of the era:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003e\u003cb\u003eLong Gray Plates\u003c\/b\u003e\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003e\u003cb\u003eSquare Getter\u003c\/b\u003e\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003erobust and precise internal construction\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eThe \u003cspan class=\"s2\"\u003e\u003cb\u003esquare getter\u003c\/b\u003e\u003c\/span\u003e is a characteristic configuration of early productions, particularly appreciated today for vacuum stability and longevity.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe tube has been tested in our lab with \u003cspan class=\"s2\"\u003e\u003cb\u003eAmplitrex AT-1000\u003c\/b\u003e\u003c\/span\u003e, yielding a \u003cspan class=\"s2\"\u003e\u003cb\u003eVERY STRONG\u003c\/b\u003e\u003c\/span\u003e result, and verified for \u003cspan class=\"s2\"\u003e\u003cb\u003eLow Noise \u0026amp; Microphonics\u003c\/b\u003e\u003c\/span\u003e, making it suitable even for sensitive circuit positions.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003eSonic Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis 1950s RCA configuration offers a typically \u003cspan class=\"s1\"\u003e\u003cb\u003ewarm, full, and three-dimensional sound\u003c\/b\u003e\u003c\/span\u003e, with an extremely natural musical presentation.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eBass: \u003c\/b\u003eDeep and round, with excellent structure and a sense of body. Never intrusive, but always well-controlled.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eMids: \u003c\/b\u003eThe true strong point: rich, textured, and incredibly expressive. Vocals are present, believable, and full of nuances.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eHighs: \u003c\/b\u003eSweet and refined, never aggressive. Excellent extension with a velvety rendition typical of the best vintage RCA productions.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eDynamics: \u003c\/b\u003eSmooth and natural, with a musical response that favors coherence and musicality over artificial impact.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cb\u003eSoundstage: \u003c\/b\u003eWide and well-layered, with excellent instrument separation and realistic depth.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎧 \u003c\/span\u003eUse in Hi-Fi Amplifiers\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eIdeal for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003etube preamplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003evintage and modern integrated amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003ephono stages (thanks to low noise)\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003equality buffers and line stages\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003ePerfect for systems that require \u003cspan class=\"s2\"\u003e\u003cb\u003emusicality, naturalness, and realistic harmonic reconstruction\u003c\/b\u003e\u003c\/span\u003e, with a typically \"American\" sonic footprint.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎸 \u003c\/span\u003eUse in Musical Applications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eAlso highly valued in instrumental settings for:\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli class=\"p1\"\u003eguitar amplifiers\u003c\/li\u003e\n\n\u003cli class=\"p1\"\u003evintage organs and instruments\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp class=\"p1\"\u003eIt offers a \u003cspan class=\"s2\"\u003e\u003cb\u003ewarm, progressive, and musical response\u003c\/b\u003e\u003c\/span\u003e, with soft and controlled saturation, ideal for those seeking character without harshness.\u003c\/p\u003e\n\u003ch3 class=\"p3\"\u003e\u003cstrong\u003e\u003cspan class=\"s2\"\u003e🎯 \u003c\/span\u003eNote for audiophiles\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eThis 1950s RCA represents a highly interesting choice for those who desire a \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 with an authentic vintage character\u003c\/b\u003e\u003c\/span\u003e, solid construction, and high performance.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe \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 guarantee stable and reliable operation, making it suitable even for critical circuit positions.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eA tube that combines \u003cspan class=\"s1\"\u003e\u003cb\u003ehistory, construction, and musicality\u003c\/b\u003e\u003c\/span\u003e, designed for those who seek not just performance, but a true listening experience.\u003c\/p\u003e\n\u003chr\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 VERY STRONG\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 = 1500 ; Ia = 0.9 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2\u003c\/strong\u003e: Gm = \u003cmeta charset=\"utf-8\"\u003e1500 ; Ia = 0.9 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\u003eMicrophonics:\u003c\/strong\u003e Low Noise \u0026amp; Microphonics – Tested and suitable for use in hi-fi systems and guitar amplifiers.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the tube suitable for use as a phase inverter in hi-fi and instrumental applications.\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\u003eShorts and GAS:\u003c\/strong\u003e Absent.\u003c\/span\u003e\u003c\/li\u003e\n\n\n\u003c\/ul\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 Vintage Tubes - Tested and fully 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 condition:\u003c\/strong\u003e\u003cspan\u003e Sufficient – Labels completely worn off. 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\u003cp\u003e\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cmeta charset=\"utf-8\"\u003eindecipherable, identifiable by construction characteristics. 1950s\u003cbr\u003e\n\n\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 Durability\" 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":"RCA","offers":[{"title":"Default Title","offer_id":57818678362460,"sku":"03641","price":64.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_40a871ba-0a0c-450a-969c-4ec9a0022eb8.jpg?v=1780908553","url":"https:\/\/vacuumtubestreasures.com\/en-fi\/products\/12ax7-ecc83-rca-long-gray-plates-square-getter-made-in-usa-50s","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}