Brian Gaff wrote:
Yes, my thoughts at first on my problem, but in the end it turned out to be
the relay contacts, not as i thought the switch in the headphone socket.
Very strange things, contacts. Of course in my case there was no actual
switch in the headphone socket, but the phones worked if you turned off the
speakers with the speaker switches. This is counter intuitive as one would
have imagined that more current would make the relay work, not less.

Stressing the PCB mechnically will also make a borderline dodge relay
contact misbehave itself.

I had a Sansui amp that did that when the owner fiddled with the volume
control. You'd think the loudspeaker protection relay had a mechanical
coupling to the control - it would drop in and out on some very exact
points of the tight controls rotation.

New relay fixed it.

--
Adrian C