Re: MOT Wiring Question

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Original poster: David Speck <dave-at-davidspeckmd-dot-org> 

David,
Good Find!  I have disassembled a couple of these old Radaranges.  I think 
the 4 kV refers to the total DC output of the doubler stage.
These MWOs have the most powerful MOTs of any domestic MWO I have 
disassembled.  The small separate transformer is indeed a highly isolated 
filament transformer.
The Radarange MWOs have at least double the power handling capacity of the 
common cheapie Sharp MWOs that I find in almost new condition by the 
dozens, though all of them put out about the same voltage, give or take 20%.

Someone posted a while back that a magnetron behaves like a 4 kV zener 
diode.  Therefore, there's no advantage to having a MOT that puts out, say, 
6 or 8 kV.  However, the more current the MOT puts out, the more microwave 
radiation you can make.  The magnetic shunts in the MOT core provide a 
degree of current limiting to regulate the whole system, as do the 
components of the voltage doubler.

Dave

>It was spring cleaning day in Ripon, WI today.  I was able to snag a 
>couple of MO's.  The one I have a question about is an old Amana 
>Radarange.  Opening it up I saw warning stickers for 4KV.  The medium 
>sized MOT's output goes to the cap, and from the cap it goes into another 
>smaller xfmr, and from that to the magnatron.  My question is: Is this MOT 
>a 4KV one, and is the other xfmr a filiment xfmr?