[Eliot Ness]

......In old radios, the electrolytics and papers get replaced by default, and micas get the benefit of the doubt untill proven guilty. In which case simple capacitance measurement will show the problem.

I often check new caps just to be sure, especially if they are the Chinese "Yellow Devils".  I have found at least one bad one and one mis-marked, and I double check caps that have already been replaced by someone else if they are the "Yellow Devils" and if something is wrong with the radio.