{"product_id":"12av7-nos-nib-sylvania-black-square-plates-halo-getter-tested-tubes-made-in-usa-copia","title":"12AV7 NOS NIB SYLVANIA Black Wing Plates Halo Getter – Tested Tube Made in USA","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e12AV7 NOS NIB SYLVANIA Black Wing Plates Halo Getter Tested Tube\u003c\/strong\u003e \u003cstrong\u003eMade in USA\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e These tubes offer a lively and detailed sound, characterized by great precision in the midrange. The black \"wing\"-shaped plates give these tubes an airy sound reproduction, with good separation between instruments, ideal for those seeking transparency and clarity of detail. The midrange is rich and full, allowing for natural and warm vocal reproduction, while the bass is defined and controlled, adding body without ever being intrusive.\u003c\/p\u003e\n\u003cp\u003e The high frequencies are bright and crystalline, yet not overly aggressive, always maintaining a certain refinement. The ability of these tubes to create a wide and deep soundstage makes them ideal for those seeking a broad and dynamic musical presentation. These tubes are perfect for those who appreciate an open and detailed sound reproduction, with an overall balanced tonality but with a marked emphasis on detail and clarity.\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eProduced by SYLVANIA - USA.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e Tested on \u003cstrong\u003eAMPLITREX AT-1000\u003c\/strong\u003e Tube tester:\u003cbr\u003e \u003cspan\u003eVoltage Test: Va = 150V, Vg = -1V\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eAverage 100% Gm = 8.5 ; Ia = 18 mA\u003c\/span\u003e\u003cbr\u003e \u003cstrong\u003eTEST RESULT: VERY STRONG\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e Section 1: Gm = 7.3 ; Ia = 15.5 mA\u003cbr\u003e Section 2: Gm = 7.3 ; Ia = 16.0 mA\u003c\/p\u003e\n\u003cp\u003e \u003cspan\u003eFurther tests performed:\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eMicrophone Test\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eEmission Quality\u003c\/span\u003e\u003cbr\u003e \u003cspan\u003eShort Circuit Test\u003c\/span\u003e\u003cbr\u003e GAS Test\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003ca href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" title=\"Why our tubes are different – ​​the VTT protocol that improves sound, reliability and durability\" rel=\"noopener\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"SYLVANIA","offers":[{"title":"Default Title","offer_id":49481795371356,"sku":"02469R","price":14.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_c1cd613d-3430-4adb-99ce-3713b1ddf919.jpg?v=1728058373","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/12av7-nos-nib-sylvania-black-square-plates-halo-getter-tested-tubes-made-in-usa-copia","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}