I just bought a Triaxis V2 serial# T-7371 so I assume it has phat mod. There is a significant volume drop when switching to LD1 Red. All other modes are pretty equal in volume so is this a normal function of the phat mod? Also, is there a way to do a factory reset? I could also use some suggestions on tubes for it - I play heavy, tight prog/power metal so I need tubes that can provide detail and not too much gain. It came with EH 12AX7's, but I've heard good things about JJ's also.