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  1. vaathi

    How to test Ei KT90 tubes

    Hello friends... I came upon a pile of used KT90 and used Svetlana 6550C ( I don't know how to figure out if it is winged or not. 16 of KT90s dont have any marking and other 16 have Ei VTL in blue lettering. Guy who sold me said the amp he was using used these some 20 + years back and he...
    • vaathi
    • Thread
    • 6550 conar kt88 kt90 tube tester help
    • Replies: 4
    • Forum: Tube Audio
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