{"product_id":"12au7-ecc82-rca-black-plates-amplitrex-matched-pair-square-getter-made-in-usa-57","title":"12AU7 \/ ECC82 RCA Black Plates AMPLITREX Matched Pair Square Getter Made in USA '56","description":"\u003ch3\u003e\n\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e12AU7 \/ ECC82 RCA Black Plates AMPLITREX Matched Pair Square Getter Made in USA '56\u003c\/strong\u003e\u003cbr\u003e\n\n\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eLow Noise \u0026amp; Microphonics –\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\u003e100% Average:\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 #1:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 1600 ; Ia = 8.2 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 1900 ; Ia = 9.0 mA\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTube #2:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 1:\u003c\/strong\u003e Gm = 1600 ; Ia = 7.8 mA\u003c\/li\u003e\n\n\u003cli\u003e\n\n\u003cstrong\u003eSection 2:\u003c\/strong\u003e Gm = 1800 ; Ia = 8.8 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 designated positions.\u003c\/li\u003e\n\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBalance:\u003c\/strong\u003e The sections are not perfectly aligned. The tube is suitable for use in hi-fi in non-critical stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring strict balance between sections.\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\u003ePrecious \u003cstrong\u003eMatched Pair of 12AU7 \/ 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 typical configuration of early RCA 12AU7 family productions and particularly interesting for those seeking the character of 1950s American tubes in a carefully selected and tested pair.\u003c\/p\u003e\n\u003cp\u003eThe manufacturing code \u003cstrong\u003e6-09\u003c\/strong\u003e places both units in the \u003cstrong\u003e9th week of 1956\u003c\/strong\u003e and identifies production by \u003cstrong\u003eRadio Corporation of America, Camden, New Jersey\u003c\/strong\u003e. The origin from the same production period, along with the \u003cstrong\u003eBlack Plates \/ Square Getter\u003c\/strong\u003e construction, adds further technical and collector's interest to the pair.\u003c\/p\u003e\n\u003cp\u003eThe tubes have been carefully tested in our laboratory using an \u003cstrong\u003eAmplitrex AT-1000 Tube Tester\u003c\/strong\u003e, achieving a \u003cstrong\u003eSTRONG\u003c\/strong\u003e classification. Tube #1 measures \u003cstrong\u003eGm 1600\/1900\u003c\/strong\u003e with \u003cstrong\u003eIa 8.2\/9.0 mA\u003c\/strong\u003e, while #2 measures \u003cstrong\u003eGm 1600\/1800\u003c\/strong\u003e with \u003cstrong\u003eIa 7.8\/8.8 mA\u003c\/strong\u003e. The values show good overall consistency between the two units, allowing them to be offered as a \u003cstrong\u003eMatched Pair\u003c\/strong\u003e, with strong, regular, and stable emission.\u003c\/p\u003e\n\u003cp\u003eBoth have passed a \u003cstrong\u003e48-hour Burn-in \/ Stability Test\u003c\/strong\u003e and have been selected for \u003cstrong\u003eLow Noise \u0026amp; Microphonics\u003c\/strong\u003e, with low and well-controlled noise. They are therefore particularly interesting for \u003cstrong\u003ehi-fi preamplifiers, input and driver stages\u003c\/strong\u003e, as well as for guitar amplifiers and other compatible equipment where quietness and stability are important parameters.\u003c\/p\u003e\n\u003cp\u003eThe individual internal sections are not perfectly aligned; for this reason, the pair is not recommended for applications such as \u003cstrong\u003ephase inverters\u003c\/strong\u003e or for circuits requiring strict symmetry between the two triodes. This does not limit their use in the numerous 12AU7 applications where absolute section balance is not a fundamental requirement.\u003c\/p\u003e\n\u003cp\u003eSonically, \u003cstrong\u003e1950s RCA Black Plates 12AU7\u003c\/strong\u003e are particularly appreciated for a \u003cstrong\u003efull-bodied, natural, and musical\u003c\/strong\u003e presentation, with rich and well-structured mids, solid and well-controlled bass frequencies, and a soft but defined high range. A typically American character that offers musicality and listening pleasure without sacrificing detail and dynamics.\u003c\/p\u003e\u003c!--nl--\"\u003e\u003cp\u003eIdeal for \u003cstrong\u003ehi-fi preamplifiers, integrated amplifiers, line stages, DACs and tube buffers, input and driver stages, and guitar amplifiers\u003c\/strong\u003e compatible with \u003cstrong\u003e12AU7 \/ ECC82\u003c\/strong\u003e, especially when a pair from the same vintage RCA production, selected for low noise, is desired.\u003c\/p\u003e\n\u003cp\u003eThe tubes are \u003cstrong\u003eVintage\u003c\/strong\u003e, carefully tested, and fully functional. Cosmetic condition is \u003cstrong\u003eadequate\u003c\/strong\u003e, with partially faded or illegible silkscreening and evident normal signs of age, while the internal structure is well preserved. They are supplied in our custom boxes for optimal protection.\u003c\/p\u003e\n\u003cp\u003eA sought-after \u003cstrong\u003eMatched Pair RCA 12AU7 \/ ECC82 Black Plates Square Getter from 1956\u003c\/strong\u003e, genuinely tested and selected by \u003cstrong\u003eVacuum Tubes Treasures\u003c\/strong\u003e, with \u003cstrong\u003eSTRONG emission and Low Noise \u0026amp; Microphonics selection\u003c\/strong\u003e: two authentic 1950s American RCAs from the same production period, ideal for those seeking vintage build quality and a classic American sonic character.\u003c\/p\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:\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\u003eCosmetic Condition:\u003c\/strong\u003e\u003cspan\u003e Adequate – Partially faded or illegible lettering, overall aesthetics with evident signs of age. 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 09th 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":59080876949852,"sku":"03801V","price":89.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/5_1f2194a6-30fa-4275-872d-162f71e1f283.jpg?v=1789120825","url":"https:\/\/vacuumtubestreasures.com\/en-fi\/products\/12au7-ecc82-rca-black-plates-amplitrex-matched-pair-square-getter-made-in-usa-57","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}