Old tube radios all need the wax caps replaced. I don't bother checking the caps, I just change all of them. All are or will soon be bad. The electroytics in metal cans tend to be okay, the ones in cardborad tubes always bad. After doing this, then I start looking for bad tubes or other devices. Tubes are more reliable than you'd think. That is, more often than not the trouble in a given set is not a tube, but some other part.
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