Re: Fw: Tesla List - Micro Wave Oven Transformers

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 07:07 PM 1/4/2007, you wrote:
> Original poster: "James Howells" <james@xxxxxxxxxxxxxxxxxxxxxxx>
>
>
> Protected by <http://www.Spamjab.com>www.Spamjab.com
>
>
> ----- Original Message -----
> From: <mailto:james@xxxxxxxxxxxxxxxxxxxxxxx>James Howells
> To: <mailto:mercurus2000@xxxxxxx>mercurus2000@xxxxxxx
> Sent: Sunday, December 31, 2006 10:23 AM
> Subject: Tesla List - Micro Wave Oven Transformers
>
> Having seen your posting on TESLA LIST
> I would be most grateful if you could explain something that puzzles 
> me about M.O.T's
>
> I have dismantled 3 microwave ovens now and do not under stand what 
> the 6 turn secondary coil is for.
> In all the ovens it has red high temperature insulation and seems to 
> put out about 3--6 .


Filament power for the cathode of the magnetron.  In the usual 
microwave oven, the magnetron (which is like a diode) has the anode 
at ground potential (because it sticks into the waveguide) and the 
cathode at high voltage.  For what it's worth, this is pretty common 
with microwave power tubes.. TWTs work the same way.
It needs a high voltage insulated winding (which is what that 
insulation is about) because it's at 4kV or so, relative to ground.