Hey guys, thought I would ask a few of you guys that have Two Rocks what tubes I should give a try. I have a Two Rock Cutom 50 that started life as a emerald 50. Its got 5 preamp tubes and 2-7581s for power amp. What new brand of tubes should I try? I don't want to spend a huge chunk a change on NOS. But if I did what would you try for NOS? Thanks for any help.