On 4 Feb 2006 13:17:25 -0800, "GT" wrote:

I checked the mag & it's ohm reading is within the correct limits, do
you think it could still be bad?
GT

Very unlikely.

A magnetron will usually fail it two modes: filament opens or emission
drops too low. In the former case you can check it easily with an ohm
meter, a tube with low emission will work but won't heat as much and
it fails over a long period of time.

Bad filament (or filament winding on the transformer, or bad filament
connection) and you'd have high voltage DC at the filament, but no
microwaves would be produced - and your turntable would probably turn.

The magnetron only has a few internal parts - a filament to emit
electrons and a plate with slots/cavities cut in it. Electrons leave
the filament and are attracted to the plate, before they get there,
the magnets bend their path so they cruise by the cavities. The
cavities resonate and produce high frequency radio waves. There's an
antenna probe to couple energy out of the tube and guides it into the
oven chamber. Very simple; not much to go wrong.
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