To quickly check, measure continuity from each line cord prong, to chassis. Make a measurement with the power switch on and off. There should be virtually no leakage to the chassis on the 5S56 (1meg or better).

This should help troubleshoot a bit.
Good luck

donnie

:I've recapped it, replaced three missing tubes and repaired cracks in the speaker cone. It plays really well on all three bands. I did install the electrolytics correctly (not connected to chassis ground). However I can meter 256 volts DC on the chassis. If I ground the chassis it goes dead with the power plug in one way, and a very loud 60hz hum with it reversed. The 256 volts is present everywhere on the chassis, tuning capacitor, control shafts, etc. I've just started trouble shooting it. Does anyone have experience with this kind of problem?