Prior to selling my entire amp setup, I was running an Ampeg SVT3-Pro (2003 model) to an Avatar 2x12. For the two years I used it, I never once found the preamp tube to make any bit of difference. When I had the tube gain dimed, then it seemed to make the sound a teeny bit fuller, but nothing I couldn't do with a tiny amount more bass on the EQ. I just left it there cuz I could, and it made the investment seem worth it. I could crank the volume and input gain to eleven and it still didn't sound (hate to say it) any good. So my question is: Are there any hybridheads (tube pre, SS power) whose tube parts actual make any difference in tone? I don't care about price much; I actually run an Ampeg V-2 (all tube) currently, so that's plenty tubey, and I plan on getting a digital head to use when my cab comes in.