"Smitty Two" wrote in message
news
In article ,
"mc" wrote:

FM stereo receiver, vintage 1973, has a noticeable background hoise
(hiss/white noise) on FM stereo regardless of the incoming signal level.
It
disappears completely upon switching to mono.

Is this normal in a receiver of that age? If not, what components are
likely to be deteriorating?

Is it only on FM, or with other sources, too? If it's noisy from a line
input too, a dirty stereo/mono switch could be at fault. Some of those
old pushbutton types were pretty marginal.

Only on FM stereo. No problems with any other signal source, stereo or
mono. Anyhow, would a dirty switch produce continuous hiss?