I have a 76 Hiwatt Custom 50, and Id like it to have more of a clean tone. I played a new Custom 100 before I bought the 76 Custom 50. I liked the clean of the 100 but it was far to loud for me. My Custom 50 has JJ Tubes. Would changing the tubes help me achieve a cleaner sound? I find the Custom 50 just starts to break up at about 50% Volume. It's great, but I want it to be an effect amp, so a very warm clean tone is what I need it to create.