tubes in a Copland 504???


I know there are 4 6550,s ( btw can I use KT-88,s) But not sure on the rest. Looks like 4 12au7,s and 1 12ax7 as a pre tube. Please help me out. I just got the amp and am looking to upgrade the tubes.
jayb77

Showing 1 response by mechans

Yes you can use KT-88s, but you may need to adjust the bias to get the most out of them and not burn them out too quickly.