I know this thread is super old, but it's still a top Google result for the question, and I just digitized the manual for this amp. Unfortunately just using a digital camera, but the result is still pretty good after some processing (edit: actually it seems to have gotten crappy looking somewhere in the conversion to PDF.. I will try to make a better version soon). Hopefully someone still finds this useful.
Thanks heaps for the info, I will be getting the old trusty back up and running, any chance you have a pic of the underside schematic of the amp