Here's the schematic:
http://www.nostalgiaair.org/pagesbymode ... 014953.pdfOther the testing and replacing the tubes, here is a list of the minimum number of items to replace in order to assure a good performing radio.
C25...hum filter capacitor - 150v - 250v
C26...hum filter capacitor - 150v - 250v
C24...tone capacitor - 400v
C23...audio coupling capacitor - 400v
C22...audio coupling capacitor - 400v
C29...bypass capacitor - 150v
C27...spike capacitor - 600v
Make sure the filter caps are mounted with their correct polarities. Wrong polarities and they go BOOM and fill the room with a rather distinctive and unforgettable aroma.
I don't see any vital resistors that would have to be replaced.
Voltages are of the range I'd use in consideration to their specific function. Even though all of the capacitors will have essentially similar voltages across their plates, some capacitors will take more of an electrical beating then others and, therefore, require a higher voltage rating in order to assure a long life. The higher the voltage rating, the more durable the capacitor.
After you clean the volume control and tuning capacitor contacts, calibrate and align the set and you should have a good performing RCA radio.