Thanks Cybercow. I’ve noted all your suggestions. Since I don’t have access to anything close to an Hfe of 220, I’m going to try a silicon PNP for Q3 as an experiment. I’m assuming by bias resistors you mean those connected to the base of Q1 and Q2, so R1 and R2 (voltage divider?) and R4? I’ll also check out the Buzzaround info on the web.
Thanks again and all best, mybud