{"product_id":"12au7-ecc82-rca-black-plates-amplitrex-matched-pair-square-getter-made-in-usa-58","title":"12AU7 \/ ECC82 RCA Black Plates AMPLITREX Tested Square Getter Balanced Made in USA '56","description":"\u003ch3\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AU7 \/ ECC82 RCA Black Plates Square Getter Made in USA '56\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eAMPLITREX Tested \u003cmeta charset=\"utf-8\"\u003e– Low Noise \u0026amp; Microphonics – Balanced –\u003cspan\u003e STRONG - Vintage RCA Production\u003c\/span\u003e\u003c\/strong\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 = -8.5V\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eGm = 2200 ; Ia = 10.5 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eTest Result:\u003c\/strong\u003e 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 Gm = 1700 ; Ia = 8.6 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 1800 ; Ia = \u003cmeta charset=\"utf-8\"\u003e8.4 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 equipment and guitar amplifiers, even in the most sensitive audio stages.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eNoise: \u003c\/strong\u003eLow and well-controlled. Silent operation in hi-fi and musical amplifiers in the intended positions.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e Very good. The sections are consistent and well-aligned, making the tube also suitable for use as a phase inverter in hi-fi and instrumental applications.\u003c\/span\u003e\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eEmission Quality:\u003c\/strong\u003e Strong – Strong and regular emission, suitable for any application.\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\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eFine \u003cstrong\u003e12AU7 \/ ECC82 RCA\u003c\/strong\u003e, authentic American production \u003cstrong\u003eMade in USA from 1956\u003c\/strong\u003e, characterized by the sought-after \u003cstrong\u003eBlack Plates with Square Getter\u003c\/strong\u003e construction. A particularly interesting configuration among the first RCA productions of the 12AU7 family, appreciated for its build quality, robustness, and typical American sonic character.\u003c\/p\u003e\n\u003cp\u003eThe manufacturing code \u003cstrong\u003e6-09\u003c\/strong\u003e identifies a production from \u003cstrong\u003eRadio Corporation of America, Camden, New Jersey\u003c\/strong\u003e, made in the \u003cstrong\u003e9th week of 1956\u003c\/strong\u003e. The \u003cstrong\u003eBlack Plates \/ Square Getter\u003c\/strong\u003e combination, typical of RCA productions from the 1950s, makes this example particularly interesting from both a technical and collector's perspective.\u003c\/p\u003e\n\u003cp\u003eThe tube has been carefully tested in our laboratory using an \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eSTRONG\u003c\/strong\u003e rating. The two sections measured \u003cstrong\u003eGm 1700 \/ Ia 8.6 mA\u003c\/strong\u003e and \u003cstrong\u003eGm 1800 \/ Ia 8.4 mA\u003c\/strong\u003e respectively, showing consistent and very well-aligned values. The balance is \u003cstrong\u003every good\u003c\/strong\u003e, with strong, regular, and stable emission.\u003c\/p\u003e\n\u003cp\u003eIt also passed a \u003cstrong\u003e48-hour Burn-in \/ Stability Test\u003c\/strong\u003e and was selected for \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e, with low and well-controlled noise. It is therefore suitable for even the \u003cstrong\u003emost sensitive audio stages\u003c\/strong\u003e, as well as for hi-fi preamplifiers, input stages, drivers, and guitar amplifiers. The good matching between the two triodes also makes it suitable for use as a \u003cstrong\u003ephase inverter\u003c\/strong\u003e in compatible hi-fi and instrumental applications. No shorts, gas, or anomalies were detected.\u003c\/p\u003e\n\u003cp\u003eSonically, vintage \u003cstrong\u003eRCA Black Plates 12AU7s\u003c\/strong\u003e are particularly appreciated for a \u003cstrong\u003efull-bodied, natural, and musical\u003c\/strong\u003e presentation, with rich and well-defined mids, solid and controlled bass, and smooth but detailed high frequencies. A balanced and engaging performance, ideal for those seeking the classic character of historical American RCA productions from the 1950s.\u003c\/p\u003e\n\u003cp\u003eIdeal for \u003cstrong\u003ehi-fi preamplifiers, integrated amplifiers, line stages, DACs and tube buffers, input and driver stages, phase inverters, and guitar amplifiers\u003c\/strong\u003e compatible with \u003cstrong\u003e12AU7 \/ ECC82\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe tube is \u003cstrong\u003eVintage\u003c\/strong\u003e, carefully tested, and fully functional. The aesthetic conditions are \u003cstrong\u003egood\u003c\/strong\u003e, with partially eroded but still legible screen printing and a well-preserved tube body. It comes in our custom box for optimal protection.\u003c\/p\u003e\n\u003cp\u003eA valuable \u003cstrong\u003eRCA 12AU7 \/ ECC82 Black Plates Square Getter from 1956\u003c\/strong\u003e, truly tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, with \u003cstrong\u003eSTRONG emission, Low Noise \u0026amp; Microphonics, and very well-balanced sections\u003c\/strong\u003e: an authentic vintage RCA example particularly interesting for quality audio applications.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eConditions:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVintage - Tested and 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 Conditions:\u003c\/strong\u003e\u003cspan\u003e Good – Partially eroded but still legible lettering. Tube 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\u003cli\u003e\n\n\u003cstrong\u003eManufacturing Code:\u003c\/strong\u003e\u003cspan\u003e 6-09 → RMA\/EIA Open Date Code → manufactured the 9th week of 1956 → Radio Corporation of America, Camden, N. J.\u003c\/span\u003e\n\n\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\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":59082422944092,"sku":"03802V","price":59.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/10_cc194b5a-bcf0-4e44-af29-428fbcde4da9.jpg?v=1789124119","url":"https:\/\/vacuumtubestreasures.com\/en-ee\/products\/12au7-ecc82-rca-black-plates-amplitrex-matched-pair-square-getter-made-in-usa-58","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}