As another owner of a Dennis Had amp (Inspire SEP Firebottle HO...high output!) I do sympathize with multi tube amp owners (owned a Jolida amp for a while that had 4 output tubes). I'm obligated to use efficient speakers but I like horns so it's FINE. The cool thing for me is my preamp uses 6SN7GTB tubes as well as the Had amp so various versions of those accumulate in my tube drawer as well as the Had power tube heap. I like Gold Lion stuff mostly and think their KT88s are great...as well as the 77s, 66s, 120s...you get the picture. It's almost too easy to take the 2 minutes or so roll 2 tubes (preamp tube is an Amperex that's likely a rebranded GE...NOS GEs are preferred in the preamp). I swap the Had with a Pass XA-25 when the mood strikes me so there's that.
Tube change.
Hate to admit I’m at the point where I want to experiment a little but I also want to do my due diligence before making a purchase. I have tubed monoblocks each amp requires 8 kt-88 power tubes. I have read a few positive reviews regarding the Sophia electric kt-88 tubes. Does anyone with tube amplification that requires many power tubes and switched to SE have any helpful info for me?