Re: Microwave Oven Choke (What's it for?)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <allanh-at-starband-dot-net>

If its connected in series with the cap, it is probably there to limit surge
current through the cap and recitfier.

allan

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 21, 2002 6:05 PM
Subject: Microwave Oven Choke (What's it for?)


>
> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
> Dear List,
>
> A friend gave me an old Amana "Radar Range". It
> belonged to his elderly mother. She said it started
> making a scary noise, and she didn't want it anymore.
> It's not just a cliche when I say they don't make them
> like that anymore, because they really don't:
>
> http://hot-streamer-dot-com/greg/amanal.jpg
>
> This thing had at least 50 lbs of steel chassis--built
> like a tank. The label says it was manufactured in
> February 1977!
>
> Getting back to the actual subject--this thing had an
> unusual component in the power supply section--an iron
> core choke. Have a gander:
>
> http://hot-streamer-dot-com/greg/amanad.jpg
>
> The rest of the PSU is conventional in every respect.
> Big 2300vac MOT on the left, .85uF/2500wvac capacitor
> with external bleeder resistor, bloc-style HV
> rectifier--the classic half-wave voltage doubler.
> Whatever the choke is, it is involved in the HV
> circuit. The high tension leads for the magnetron pass
> thru it. Oddly enough, I don't see a filament winding
> on the MOT. Could this be a filament xfmr, or perhaps
> a ballast for a 120vac filament? Any appliance repair
> tradesmen out there? What is that thing?
>
> Regards,
>
> Greg
> http://hot-streamer-dot-com/greg
>
>
>
>