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  1. I

    Too good to be true: my new/old Mark IV

    It only arcs when the power tubes are installed. I've tried two separate sets of power tubes; one of these sets is known good at this time (they're brand-new Mesa tubes, the 6L6's work in my IIC+ and the EL-34s work in my little ADA amp.) The arcing noise is definitely coming from the OT, not...
  2. I

    Too good to be true: my new/old Mark IV

    Yes, I'm sure the pull silent isn't off, and yes, I'm sure it's the output transformer that I'm looking at and that is causing the problem - you can hear the darn thing arcing when it ought to be outputting instead. It actually does output a miniscule amount of current to the speaker, but it's...
  3. I

    Too good to be true: my new/old Mark IV

    So I bought a Mark IV long head yesterday. Total impulse buy, guy's like "I lost the speaker cabinet, can't play it for you, but it sounds excellent," and the price was, well, too good to be true. I got it home and retubed it with known good brand new tubes (Mesa brand; I had a few lying...
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