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Got all new mesa preamp tubes, 1 SP ax7, 1 12at7 and 3 12ax7, seems to sound better now. I guess the GT were not great. Even the lead drive is better. Damn, everyone kept saying, change the tubes. I never realized how big of an improvement new tubes was going to be until now. When in...

Hi All, I recently purchased a used mark iva combo with an EV speaker. I just put in 4 new boogie 6l6 matched yellow. I'm trying to understand how much volume a combo will put out. I have used the recommended settings from a scanned copy of the original Mark IV manual, and with the lead...