FM band tuning noise

This newsgroup is for the discussion about the design of electronics.

It isn't about the repair of electronic devices.

There is a whole newsgroup for that, which you were either too lazy or too clueless to find before you posted here.

Michael

Michael! Oh, CRAP! What the f*ck have you contributed to this group?

...Jim Thompson

That could be the problem, particularly if the crackling noise is worse while you are tuning the unit.

I'm not familiar with the construction details of variable polyester caps, but the air dielectric variables have two places that dirt can get in. Dust can get between the plates. For this, just blow it out with some canned air. Some of these units have a wiper or sliding contact for the rotor side which can accumulate dirt. I'd use some tuner contact cleaner on a thin piece of cloth or other non abrasive material. Slip it between the contact surfaces and clean them. I've been told that some of these contacts have thin plating, so abrasives aren't a good idea.

I don't know. That might be too new to interest antique collectors. A friend of mine was able to locate data on a 1940's era radio he is restoring on the web.