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  1. R

    New(used) Mesa Boogie Mark IV owner and pentode problems

    Monsta-Tone .... thanks a ton! I will go through this and see what I can find. I have changed the power tubes (gone to 6L6's and EL34's) however I haven't cahnged any of the others yet.... more to follow! ken;
  2. R

    New(used) Mesa Boogie Mark IV owner and pentode problems

    well I tried two sets of tubes and here are the results; 1) Ruby tubes 6L6 (2) - EL34 (2 - outer sockets of course) -- the warble disappeared and I actually like the sound of the tubes (dirty) 1) SED winged C 6L6's (4) -- the warble is still present with these. I even tried a combination...
  3. R

    New(used) Mesa Boogie Mark IV owner and pentode problems

    thanks for the thoughts on mixing the tubes. I did just order 4 matched 'Winged "C" (SED) 6L6GC SV-6L6GC' tubes as they seem to be well liked. I will try them out and if it still a bit darker I will slap in a couple of EL's thanks again. I think that it is the tubes myself. It worked fine in...
  4. R

    New(used) Mesa Boogie Mark IV owner and pentode problems

    At least I hope it is some setting somewhere. If I set the amp to use pentode I get an unusable warble (clipping) noise on the lead channel. I can't seem to find any info on this and hopefully it is just a problem I can fix changing tubes or something of the like. the tubes are the original mesa...
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