I've got one of these in for repair (one channel down) and it appears to
be the balance control that's faulty. Cleaning helped in that it now
worked at max (on the faulty channel) but nothing in the middle. Opening
it up revealed a crack in the track.
It's a special in that the first half of the rotation stays at low ohms
while the second goes from that to 50k. The other channel, the mirror of
that. I've come across this before on a Sony amp.
But I can't find a spare. It's an Alps 50KMN (724F) with a centre indent
and the H K number is 5113-50399122.
Anyone know a supplier? I'd guess it's 30 years old.
*I'm not as think as you drunk I am.
Dave Plowman London SW
To e-mail, change noise into sound.