If you're going to do it correctly, rebuilt the amplifier. New capacitors and tubes are a must. Remember, this amplifier is pushing 50 years old. Complete capacitor kits are available from Vern Tisdale.
SPEAKER CONNECTIONS
It has been said that the solder lugs have been known to turn and short, taking out the audio transformers. It is suggested that you either tighten these lugs very well, or remove them. Tubes aren't cheap, but tranformers are cost prohibitive, if they are even available.