I've got an SVT-CL on the way in the mail. I'll admit I don't know too much about the functions of tube amps; I'm new to the game. I'll try this when I get an opportunity, but I'd like to know: what is the difference in sound when diming the master knob and using gain as the volume control, as opposed to the other way around? I suppose there are also ways to adjust volume in-between those two extremes. The main question I have, though, is: am I putting more strain on the amp by doing one or the other? i.e. if I dime the master are the tubes going to need to be replaced sooner?