Wolf--mine has GL KT88s and an RCA 5u4g. I'm hot to trot on trying some different tubes, but don't know what works. Have an inquiry to Mr. Had through the "auction site." Haven't heard yet. I understand he tweaks designs here and there, so what might work for one might not work for another? If I have to stick with KT88s and 5u4g, it's fine, but....
OP--might you be considering having a sub (or more) and high pass on your amp? I don't know answer, but perhaps that might be a factor in some of the recommendations. Throwing that out there.
OP--might you be considering having a sub (or more) and high pass on your amp? I don't know answer, but perhaps that might be a factor in some of the recommendations. Throwing that out there.

