electrolytic capacitor replacement question

[kb12]

Hello all,

I just bought my first tube radio - a cheap Sylvania AM, probably from the late 60s. I dont know much about radio electronics but want to learn. I turned it on and the stations came in clear but there was a loud hum. A bit of searching and I have come to the conclusion that it is the electrolytic capacitor that needs replacing. I found the capacitor and on it there reads 40-60, 20-40 and 10-20. What new replacement capacitors should I look for to replace this old one? Too high of voltage is better than too low right? What do the ranges mean? Thanks for any help you can give!