The power amp appears to be direct coupled so I'd guess a few blown up
transistors back down the line too.

Some amplifiers of this vintage were DC couple all the way back to the
pre-amp'. The only sure way to repair them was to replace every
transistor
on board and very carefully check all resisistors and caps' before
firing up.

You may also find such devices as pots to balance the output
transistors
bias which if not properly set will again send out smoke signals.

The things really were a pain in the arse with some amps' blowing up
even
if the loudspeakers were left disconnected!