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  1. L

    Mark IV-A Tube Question

    Hello, Everyone, I'm restoring a Mesa Boogie Mark IV Rev A, wired by Kaydee in June 1992. For the preamp tubes, there is one 12at7 tube, three 12ax7 preamp tubes, and one that is completely unmarked. Questions: 1. Could someone please confirm that the unmarked tube should be a 12ax7? 2. Is...
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