Hey guys, I'm definitely a noob when it comes to amps. I have the 90's reissue version of the 63 Brownface Vibromate. I had it taken to a tech in Hamilton, and he added the bias circuit. I bought all new tubes for the amp, and it sounds great, but I can crank it to almost 7 or 8 and it is still pretty clean. Is there anything I can do short of buying different tubes? I remember the tech saying that the matched pair may have been too high of a bias?. But I could be wrong and they were too low.?