I found an old Guild Maverick. Uses a 7247 PI. Can't find schems anywhere. It's a funky little amp with 2-10's and cathode biased 7591's. Good size xfrmrs and larger value caps. 2-250uf and 4-47uf. Nice strong tremelo but the reverb tank seems to be a problem. Fender replacement doesn't do a thing and I get alittle output from a Marshall unit. The circuit gain is strong. It's a "pinkface". I don't remember these amps. Anyone have experience with these? Thanks.