Hmmmm.
Well, I worked over the power supply, replacing caps and installed two new rectifiers --only to run into another problem.
The problem with a short in the heater line has been found. Its the transformer
I isolated the heater lines from the transformer and there is near infinite resistance with all the tubes removed. However its a dead short between the heater winding and ground. Even disconnecting the lead still results in the tranny getting hot and eventually tripping the breaker on the variac at about 60 volts
Since I have no service literature I can't find a suitable replacement. The model # and chassis # tags are missing so there is no way to identify the set.
This one is dead in the water, boys. Don't think this patient will recover