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  1. A

    Mark IIc clean channel problem

    Thanks guys. I need to get some 6L6's before I troubleshoot further, and I guess I should get a couple of preamp tubes as well since they are suspect. I noticed in the link that GTS sent the manual suggests using an SPAX7 tube in the V1 socket. Is that still the standard practice? BTW, does...
  2. A

    Mark IIc clean channel problem

    Thanks GTS, I will replace those EL34's. The tech I took it to back when I bought it installed those, he must've been confused about the 60/100 switch. Thanks too for the link and I'll try changing out the preamp tubes you suggested. Adam
  3. A

    Mark IIc clean channel problem

    Hello everyone, this is my first post, sorry to ask for advice right off the bat. But I'd appreciate any help you can give me. I have a Mark IIc head that's having some issues. The lead channel sounds awesome but the clean channel sounds terrible. It has been sitting for about 10 years so it...
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