[codefox1]

Well, the Electrolytic capacitors can be replaced with two 10 or 16 MFD 350 volters, get the polarity correct, and don't even think about pluggng it in before you do this. All the tubular capacitors must also be replaced, and whilst you are at it, the carbon resistors as well, only a few, cheapk, easy to do at the same time. If the transformers are still OK, and the wiring is not rotted, last but not least would be tube failures with rectifier and audio output primary suspects. Fuse or power up slowly on a variac when you think you are ready. Let us know how you fare!.