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Recent magnetrons are ceramic with metal endcaps. Enough ceramic isThe classical connection to the magnetron was via the cathode.
required to hold off the 4000 volt accelerating potential.
Recent disassemblies has shown ceramic ring magnets around the
ceramic midsection of the tube.
Have not yet attacked one of the newer 'Inverter' designed circuits.
The older circuit was pretty much straight forward brute force 60 Hz
step-up transformer power supply. Large high voltage capacitor and
diode to feed the anode. /snip/