1951 Valco Supreme Model 510-1B trouble shooting cutting out after 10-15 min.

[JGk]

I was doing some trouble shooting for a friend on a Valco-1b amp. The amp works but after 10-15 minutes it starts cutting out if I let it sit or a while it will fire up and do the same thing. Nothing has been changed in the amp I was thinking filter caps, broken solder joint or a burnt resistor. If anyone has any insight I would be grateful for the info. Thanks JK

[PRR]

> any insight

I (too) would be thinking filter caps, broken solder joint or a burnt resistor.

Especially solder joints and antique resistors.