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  1. C

    Mark IV losing treble and gain

    Thanks for the advice. I was able to borrow a Tung-sol from my friend. I only tried it in V2, but it made a huge difference. It was much more like how I remember the amp sounding before this problem, so it sounds like that tube has gone bad. I guess I will just order some new preamp tubes as...
  2. C

    Mark IV losing treble and gain

    It is difficult to tell for channel 2 because I only play it with effects (and it is the least clear of the three channels in my experience), but both channel 1 and channel 3 have experienced these changes.
  3. C

    Mark IV losing treble and gain

    Hi everyone, I have a Mark IVb which I have owned for almost a year. Since I bought it, I have replaced all of the power tubes and two of the preamp tubes (V1 and V5). Over the last two weeks or so, I have noticed that the amp was losing high end and a little bit of clarity. It is still...
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