You might want to check some of those caps. I always believed micas to be bulletproof, until I found some bad ones in a couple of 50-year old TVs. Same for bathtub style caps. Somebody told me they were all oil filled, and good forever. I tested a couple in a Scott 800B radio, and they leaked like the devil, so I replaced 'em and the radio was good to go.
I'm not telling you to shotgun every cap, but it costs nothing to check, eh? After 60 years or more, even usually-good quality components may be showing their age