I've built some SCA preamps too: N72 & J99. I combined them with a DI kit from JLM (SCA wasn't selling DI's at that time) into some custom chassis. Pics on They sound really great. Used the N72 for kick, snare and bass guitar DI, J99 is great on (ribbon) overheads... Have done some other DIY: gainclone amp, another mic preamp, speakers, guitar stomps... Still thinking about a DIY compressor. If anybody here has some experience with a kit or schematic, I'd be very interested. Eddy