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Re: magnetrons as diodes
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 05:25 PM 1/5/2007, you wrote:
Original poster: Ed Phillips <evp@xxxxxxxxxxx>
If you use the original microwave oven transformer, you can use the
filament winding to heat the cathode like in the original
configuration, and the case would be the anode of the diode. If the
magnets were removed, I don't think the cavities inside would
resonate, so I don't think microwaves would be produced. "
Absolutely right on both counts. Don't know what the voltage
drop will be though. Certainly more than a string of 1N4007's or
something like that but might be usable.
Might be a lot more robust than the semiconductor string. One
advantage of old standard rectifier tubes like the 8020A is that
they'll tolerate oopsies a lot better than a string of 50 1n4007s.
Given the basic design of the magnetron is as a moderate efficiency
power oscillator, I'll bet it would handle the odd flashover or
overcurrent or spike pretty well. The reverse voltage breakdown is
probably in the 10 kV range, too. And, cheap to replace (as compared
to the 8020As, which pretty pricey).
Easy to tell by energizing the heater and measure the voltage drop
vs current with a DC supply.
Indeed. Easier than firing it up at 2kV, too. Good idea.