Have you tried tube rolling? I have this amp and put Genalex Gold Lion KT88 tubes in it. I like the combo.
Also, the amp will accept 6550 tubes, but you have to reset the bias. Some owners prefer the sound of 6550's to KT88's
I also replaced the 6SN7 and 6SL7 tubes with NOS Sylvanias. This did improve the sound, but not to the extent that replacing the power tubes did.
Also, the amp will accept 6550 tubes, but you have to reset the bias. Some owners prefer the sound of 6550's to KT88's
I also replaced the 6SN7 and 6SL7 tubes with NOS Sylvanias. This did improve the sound, but not to the extent that replacing the power tubes did.