Hi,

Looks like we back in service with a new magnetron! My guess is that
something shorted in the old magnetron when the unit heated and dumped
filament current through the diode, burning it open.

Thanks to all for the help. (Bert, as a result of your suggestion I
did power up the high voltage circuit with a new diode before
replacing the magnetron. The diode held, so I figured the capacitor
OK. Good to check because the new magnetron not exact and needed some
work to fit in.)

Regards,
Jim