Been used as 1ch amp for 20 years but now wanting ch2 up and working.
Someone in the 80s must have tried repairing, replacing a TBA231 with a
741 where it was a blown associated 741 , still there,now changed, that
was probably the problem. TBA231 unobtanium (sensibly)
datasheet
http://www.bg-electronics.de/datenbl...ise/TBA231.pdf

Have tried cobbling together 2 x LM301 wired onto a DIL socket and have
the ch2 working but fixed volume. Vol pot is fine.
What would be the generic name for this sort of vol control, wiper to
gnd and track ends of pot via loads of Rs and Cs to the dual TBA B side
output and inv i/p of A and inv i/p of B , be called?
The ch1 vol control is the same wiper gnd and that is working order and
the wiring looks the same .