Although those here that feel that solid state amps can sound as good or better than tubes for guitar are in a minority, I think that there is a general consensus that some solid state amps sound considerably better than others. Here's the question for you high-level amp gurus out there - what specific design/circuit/component aspects make the difference between a great sounding solid state amp and a mediocre one? With tubes I generally have a feel for design aspects like cascading gain stages for crunch, "sagging" rectifiers, saturating vs. hi-fi transformers, etc., but for solid state I don't have as good a feel for it, partly because theres little serious discussion of the topic. As far as I can tell, if you like solid state you just buy the one you like and are done with it. I suspect that solid state amps, like tubed amps, might respond well to some tweaking, and would like input on things to try, or at least why some sound better than others (so I know what design elements to look for in future purchases). I'm particularly interested in older, straightforward designs like old Peaveys, Rolands, Polytones, and Yamahas for this discussion, not so much digital stuff. - after all that typing I needed a banana, man.