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  1. C

    Mark IV tubes overheating, hum, popping

    Seems like hum was caused by faulty guitar cable. Ground wire was not properly soldered. Problem with tubes got more interesting. Today A and B were glowing orange instead of D and C. But after awhile they switched back to D and C.
  2. C

    Mark IV tubes overheating, hum, popping

    Hello! I have a Mark IV B combo. Worked well for about 5 month. Recently I've noticed several problems. First, hum. It' not very loud but noticable. None of the controls affect it except Lead and R2 channels louder than R1. Second, really loud popping and cracking when switching from standby...
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