[PAradiogeek]

Thanks for the responses everyone.

There are two mica (or at least domino-like) caps in the radio. One of them is that 47 pF cap. Spraying that cap with freeze spray after the radio warms up doesn't seem to affect the tuning. I also tried cooling other components in this circuit, but none of them being cooled affects tuning.

I cleaned the tube sockets and pins as suggested and I believe the severity of the problem has lessened somewhat. One other thing I've noticed since I've been investigating this is that the volume also seems to go down a little over the warmup period. I'm not sure if this could be related to the 'tuning' problem, could it?

Thanks,