Check to see if any or all of the pass transistors are shorted.

Bzzzt, wrong, would you like to try for what is behind Door #3?

If the Pass Transistors were shorted, you would see the voltage of the
filter capacitors and rectifiers on the output. He stated that he had
"No or little output voltage". This would indicate that the Pass
Transistors are OPEN, blown that way by the High Current when the output
was shorted, or the rectifiers are blown OPEN and not producing any
DC to the filter caps.


I don't debate or try very hard to teach idiots but the Astrons have a
crowbar circuit that will activate and the output voltage will drop to a
very low value. Most simiconductors fail by shorting and are not blown
open.