The peavey TMax i purchased has two preamps; a solid state and a tube premap (single 12ax7) I can run either preamp seperately or blended together. It came with an EI 12ax7 and was louder than the solid state but really lacked warmth and was clanky sounding. So i popped in a groovetube 12ax7r i had laying around from my blues deluxe, much warmer but made it quieter than the solid state side when both are dimed. So i put in a regular groovetube (non r) in the peavey, even warmer, a little louder than the solid state side and the best option so far. It adds a growl and a texture over the solid state. I still feel i can do better though, i can try a tube from my Boogie Subway rocket. I have one to try since I put the EI in my mesa, but i do not like it at all. So i want to put my mesa back in the boogie. What would be a good tube to buy? I am going for max volume (to use as a boost to my solid state channel when blended) and good warmth or at least good tone and character.