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.