these were good sets, I wouldnt mind working
on them all day.
Easy first. If it has a headphone jack plug one in
& see if it works. Also jacks go bad & get cold solder
on them if they are used much.
Speaker..... Unplug it & hang any old speaker in.
After that will have to dig in. See if you can find the
chassis number. Starts with TAC ####
On a black & silver label probably near the HV trans.
I can see if I can find something close.
73 Zeno