holy cow this amp is so awesome. someone said something about sterile above and I couldn't disagree more. yes, they are very tight and articulate but I am not hearing anything close to sterile at all. the boost on the clean channel is a really great sound - very powerful.
right now it has KT88s. I plan to keep them for a while since it sounds so good but maybe put in 6550s down the road. my viper and mako have 6550s and I pretty much think they are my favorite type of tubes.
what preamp tubes do you guys like the best for these amps?