[beery]

Hi Ed,
Sometimes the transformer's EHT winding is intact, but it is the winding that supplies the rectifier's heater that breaks down. You can check this by disconnecting the heater connections and using a solid state diode instead. One from a microwave oven should work.

You can use a wire ended Mazda U25 at a push. You will had to add a resistor to one of the heater connections to drop 4v down to 2V.

Cheers
Andy