I am wondering which amp you have experienced that has a nice master vol. I have tried the pre and post PI master volume on the 5E3. For me both seem to suck the tone out of the amp when I turn it down to a house vol. . I was going to try it on the 6G2 but think it would be much the same thing. It may be the nature of the master vol for these amps since it is not a stock function. The orange tiny terror seems to do it better, but I can not understand what makes it function better, I don't own one manybe it is much the same. Any insights into master volumes would be appreciated. Maybe a pentode/triode pot would work better, or would it work better on cathode follower amps. http://www.prowessamplifiers.com/schematics/images/tiny_terror.pdf Cheers Ron.