I have an old behmoth of a solid state amp - an Audio Centron for pro audio use. One channel is out. It consists of a lot of discrete components on some PCBs driving a row of power transistors. I guess the cheapest thing is to just take the time to troubleshoot it, but before digging in to the dusty old monster I've considered the option of reusing the power components and replacing any dead power transistors, but then replacing the rest of the amp with some more modern circuits. Anybody know of sources or info on doing that? I know some electronic basics and have successfully modded my guitar tube amps, but have little experience with solid state circuits, so if there isn't already a beaten path I can follow I'm probably going to have some tough slogging.