McIntosh 1700 receiver TO-66 driver-stage PNP transistors
I got a r e a l l y rough-shape MAC 1700 receiver at a flea market for $25. [It, obviously, had been in a damp cellar for a long, long time...A LOT of the under-chassis was rusted at many of the electrical connections.] However, being familiar with rebuilding vintage gear (all flea market/garage sale finds...I've rebuilt -and run- a 1971 AKAI GX-365D r-t-r; 1972-era AR3a speakers [I've re-capped with polypro film caps and re-wired with 14AWG automotive-grade primary wire]; and, a -re'capped- 1981 AKAI UC-U3 "micro desktop amp" [but it handles 4-ohms better than most receivers 3x bigger!]). Anyhow, I'd like to COMPLETELY rebuild and use the MAC. However, one channel DID NOT match the other on this unit; and I just want to be certain about parts (I do know the power transistors are all MJ15003). My question is this (I don't have a newer-enough mobile browser to receive the schematic outright): Of the 6, chassis-mounted driver-stage transistors; how many of them are PNP? See, I'm using two NTE 175s (NPN) with the compl. NTE 38 (PNP) on the outward-facing left on each side. I apologize if this question is stupid, but: Is this correct(?); because, one channel will work perfectly; however, the fuse on the TRIAC board (facing the tuner sub-chassis) blows immediately...even with all the protection diodes replaced on the power transistors; the TRIACS replaced; the BI-POLAR 10uF caps replaced; and the small, .0056uF cap across the 10k resistor bridging the base-of-the leftward transistor with forward voltage of the 1N4004 diode. Thank you.