new to tubes

[dtvmcdonald]

Its a 0.047 microfarad paper capacitor. Replace with a like value
600 volt mylar. It may be directly across the AC line, so you
need a really high quality one.

These striped caps are known as "bumblebees" and they really
tend to behave like that one.

By the way, that blue thing is a selenium rectifier. If the radio
starts to stink very very bad, it's the cause. Bad ones cause the
selenium to react with its paint and make hydrogen selenide gas,
with is roughly 10 times time as poisonous as hydrogen cyanide.

If that happens, take it out doors immediately.

Doug McDonald