HI there. The transistors are mounted on a sub-frame onto which the external heat-sink is bolted. I really would like to re-instate this amp to "original" condition, so, while I can "make a plan" that's not really where I'd like to go with this. By the way, I managed to download the service manual for this from "HiFiEngine.com." The original transistors for this unit are 2SD118 - which can be directly replaced by 2N3055's (if you can still buy good ones - the cheap ones are really crappy!) but I'd like to source the original types though!
regards. The Soundman