Hi gang here is a copy of the schematic for the version I am working on. It is good advice to replace any parts with the original ones. I think the Motorola MC1303L fix will and replace the transistors will fix it. I just need a source of parts. I replaced a chip in a peavey PA head yesterday and it fixed it. I have a little experience soldering and reading schematics , but I always apreciate the help and experience others have. A source for parts would be a huge help

I have aquired a Gibson G-80 chassis and a schematic. The amp hums and shuts off and hums and shuts off. I examined the schematic and there was a difference in the Chip in the input channel. the schematic shows a Motorola MC1303L and the actual chassis has a Motorola SC17063L. I am having a hard time finding any parts as this was built in 1971. I would like to replace the IC's and output transistors. does anyone have a good source to obselete parts? some has probably tried to exchange the chip at some point. The PCB is clean and all the parts look good (not burnt) If someone has one would post some layouts or other pics. I would appreciate it! This amp was made in three flavors in the output section mine is the TIP version (TIP 29C,TIP 30C,and TIP 33B. I would like to build this into a Head version it was a 4x10 combo amp. All help is appreciated, thanks !