{"product_id":"12ax7-ecc83-webcor-by-rca-long-black-plates-square-tilt-getter-made-in-usa-55","title":"12AX7 \/ ECC83 Webcor by RCA Matched Pair Long Black Plates Square Tilt getter Made in USA '55","description":"\u003cp\u003e \u003cstrong\u003e12AX7 \/ ECC83 Webcor by RCA Matched Pair Long Black Plates Square Tilt getter Made in USA '55\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 The \u003cspan class=\"s1\"\u003e\u003cb\u003e12AX7 \/ ECC83 Webcor\u003c\/b\u003e\u003c\/span\u003e , \u003cspan class=\"s1\"\u003e\u003cb\u003eMade in USA 1955\u003c\/b\u003e\u003c\/span\u003e , is a signal tube of great historical appeal, made by \u003cspan class=\"s1\"\u003e\u003cb\u003eRCA\u003c\/b\u003e\u003c\/span\u003e for Webcor to the highest construction standards of American production in the mid-1950s.\u003c\/p\u003e\n\n\u003cp class=\"p1\"\u003e The configuration with \u003cspan class=\"s1\"\u003e\u003cb\u003elong black plates\u003c\/b\u003e\u003c\/span\u003e and \u003cspan class=\"s1\"\u003e\u003cb\u003esquare tilt getter\u003c\/b\u003e\u003c\/span\u003e identifies one of the most appreciated versions for its mechanical solidity, operational stability and authoritative sonic character. The proposed pair is \u003cspan class=\"s1\"\u003e\u003cb\u003eselected as a Matched Pair\u003c\/b\u003e\u003c\/span\u003e , with coherent behavior between the two specimens and uniform sound output, fully respecting the original RCA character.\u003c\/p\u003e\n\n \u003ch3 class=\"p3\"\u003e\u003cstrong\u003eSound Characteristics\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eBass:\u003c\/b\u003e Deep, full, and well-controlled. The low range offers body and support without overpowering the musical message, always maintaining good articulation.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eMids:\u003c\/b\u003e This version's strong point. Rich, dense, and textured, with very present vocals and acoustic instruments delivered with the realism and harmonic depth typical of '50s RCAs.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eHighs:\u003c\/b\u003e Sweet, refined, and well-integrated. The highs are extended but never aggressive, with a naturalness that favors prolonged, non-fatiguing listening.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eDynamics:\u003c\/b\u003e Smooth and authoritative. Excellent microdynamics and natural transient response, with a sense of continuity and control that enhances the overall musicality.\u003c\/p\u003e\n\n\u003cp class=\"p3\"\u003e \u003cb\u003eSoundstage:\u003c\/b\u003e Wide and stable, with a well-layered soundstage and natural separation of levels. The image is credible and coherent, without artifice.\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\"\u003eIdeal for input and preamplification stages in medium-high and high-end hi-fi systems, where you are looking for \u003cspan class=\"s1\"\u003e\u003cb\u003etonal body, naturalness and musicality\u003c\/b\u003e\u003c\/span\u003e . Particularly suitable for jazz, vocal, classical and acoustic music.\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 They are also popular in vintage and boutique guitar amplifiers, where they offer rich harmonics, expressive mids, and an authentically American 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\n\u003c\/h3\u003e\n\n\u003cp class=\"p3\"\u003e \u003cspan class=\"s2\"\u003eThis\u003c\/span\u003e \u003cb\u003e12AX7 \/ ECC83 Webcor – Long Black Plates – Square Tilt Getter – Matched Pair (1955)\u003c\/b\u003e \u003cspan class=\"s2\"\u003erepresents a\u003c\/span\u003e \u003cb\u003every high quality American production\u003c\/b\u003e \u003cspan class=\"s2\"\u003e, with a warm, full and deeply musical timbre.\u003c\/span\u003e\u003c\/p\u003e\n\n \u003cp class=\"p1\"\u003eA selected pair for those who want \u003cspan class=\"s1\"\u003e\u003cb\u003ethe classic RCA sound of the golden years\u003c\/b\u003e\u003c\/span\u003e , balanced and authoritative, in full coherence with the \u003cspan class=\"s1\"\u003e\u003cb\u003eVacuum Tubes Treasures\u003c\/b\u003e\u003c\/span\u003e philosophy.\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:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eGOOD \/ 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\n \u003cstrong\u003eSection 1\u003c\/strong\u003e : Gm = 1600; Ia = 1.0 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 1600; Ia = 1.0 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 = 1500; Ia = 0.9 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cstrong\u003eSection 2\u003c\/strong\u003e : Gm = 1400; Ia = 0.8 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 Excellent – ​​Very strong and stable output, no fluctuations.\u003c\/span\u003e\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\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 274 535 → 274 indicates the manufacturer, i.e. RCA Victor Div., Radio Corporation of America, Camden, NJ - 535 → 5 (out of three digits) → 1955 - 35 → 35th week of the year\u003c\/li\u003e\n\n\u003cli\u003e\n\n \u003cmeta charset=\"utf-8\"\u003e274 530 → 274 indicates the manufacturer, i.e. RCA Victor Div., Radio Corporation of America, Camden, NJ - 535 → 5 (out of three digits) → 1955 - 30 → 30th week of the year\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":56638333780316,"sku":"03405","price":21400.0,"currency_code":"ALL","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/1_8b0afdb0-b2a3-4a8c-bfc9-13424cc9fc7a.jpg?v=1770132880","url":"https:\/\/vacuumtubestreasures.com\/en-al\/products\/12ax7-ecc83-webcor-by-rca-long-black-plates-square-tilt-getter-made-in-usa-55","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}