I've had mine for awhile now and I think I'm due for a re-tube.

Has anyone used KT77's in theirs? How did you like them?

And recommendations on other EL34s and 12ax7s to try out?

I've been playing everything from stoner rock Kyuss-ey stuff to bluesy Gov't Mule type stuff. I like the sound of the amp and don't have a problem with it being overly bright that a lot of people complain about. I'm just looking to experiment a little and see if I like it more.