Like the title says, I want to get a tube amp instead of trying to buy pedals to give me that overdriven sound for my SS amp but dont know how they work. I would really like a small combo like Fender Pro Jr, Blues Jr, or a Champ of some type. I have played a Vibro Champ along side a Blues Jr, and was more impressed with the Blues Jr's ablity to give that overdriven sound at a lower volume. I have also played a Pro Jr but not next to a Blues Jr to compair. The Pro Jr I felt needed to be louder to get that overdriven tone the Blues Jr was able to give me. I'll be mainly at home so I dont think I would be able to crank the volume like I needed to on the Pro Jr and Vibro Champ. My question is since the Blues Jr has a master volume and a volume, are you able to turn up the volume on the amp but use the master volume to limit the actual sound coming out of the amp? Is that how master volume amp's work? Are there any good websites or books to checkout that explain how they work? Or is it different tubes?