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Posted to rec.audio.tech,sci.electronics.repair
Barry Mann
 
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Default FM hiss, vintage 1973 receiver

If the gain of the RF stage or the IF strip is low, there will be some
noise.

A fairly common failure in older units is the trimmer capacitor(s) on
the tuning capacitor -- especially the plastic cased trimmers.

Other than as a hobby, I don't recommend spending much time messing
with the unit. So many parts are at the end of their expected life
(especially the capacitors), you could be chasing a cascade of failures
-- or not, no one really can predict what the next failure might be.

I can imagine an oscillation somewhere is upsetting the AGC or stereo
decoder.

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