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  1. S

    Mark IV-A Tube Question

    Found this 4 x 12ax7 1 x 12at7 Will look for a layout diagram if you need one Or check my mark iv a
  2. S

    Mark IV Version A

    Whoops Cant figure how to delete my post here
  3. S

    New Member. Mark IV A. need help

    Looking for this Jan-2025. So glad to find your post Thanks
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