It came with 6L6s in it, and I'm not changing them out, haha. Sounds great as-is. I've got the master up between 10:30 and 11:00, Volume varies between 1:00 and 3:00. If I set Volume at 1:00, the clean is nice and clean with most of my pickups, Red mode has a great crunch, and I goose the Blue...