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I have used ceramic on IF capacitor replacement in the past but now that I have been able to find new mica caps I use them. I have never had any trouble with ceramic though. 22 pf for FM circuits and 100 pf for AM circuits has always worked for me. I am seeing a lot more bad mica caps in IF's, probably 75% of the 50's-60's tube radios have these bad caps. The radio might start to work good when all other caps have been replaced but after a short while of playing bad mica caps began to show up, or too often you replace all other caps and there is no sound and it is bad caps in the IF cans. Hammarlund HQ-180 has been the most difficult to repair radio with the bad mica caps as there are so many IF stages.
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