Appliance Repair Aid wrote:

JJ wrote:

snipped

I was under the impression, they either heated or didn't, and didn't
think there was an in-between.


You where wrong

Low output. Occurs as cathode emission decreases from long use.
Symptom: Reduced cooking power.



Hey, maybe you can jolt a magnetron cathode with a short burst of
filament overcurrent to boil off junk and revitalize the cathode surface
like we used to do with B&W CRT cathodes back in the 50s?

Remember those little autotransformer CRT "boosters" they used to sell?

Thanks for the mammaries,

Jeff

--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"As long as there are final exams, there will be prayer in public
schools"