Re: MOT secondaries

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

Original poster: "Matthew Smith by way of Terry Fritz <twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>

Hi Ben

The heavy wires the filament winding for the magnetron.  The outer spade 
  is one end of the HV secondary, the other is connected to the core, 
which is connected to mains neutral.

Unless you're feeding a VTTC, snip the filament winding connections so 
that they don't get in the way.

Your output is between the core and the single spade connector - this 
being at around 2kVac with respect to ground.  (Due to grounded core.)

For more output voltage, use two transformers - primaries in parallel 
(antiphase), cores connected with output on the two single spades.  More 
than two transformers can be used in varying configurations and, of 
course, voltage multiplier/level shifter circuits may be employed.

Take care with these - if NST's are lethal, these are lethal-lethal - up 
to half an amp at 2kV...

Cheers

Matthew Smith

Tesla list wrote:

> Original poster: "Ben McMillen by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <spoonman534-at-yahoo-dot-com>
> 
> 
> Hi all,
>   There's one thing about MOT's that I don't understand.. There seems to be
> 2 secondary windings.. The first is quite obvious.. the two heavy wires
> that connect to the magnetron.. but then there's a second winding, one end
> of which goes to the core and the other to a spade lug.. What's this one
> for? Does it have something to do with the voltage doubler part of the
> setup? Is there anything that can/should be done with this? (As in, does it
> pose any kind of potential hazard and could it be modified to give more
> output voltage?) Thanks for any info.. 
> 
> Coiling in Pittsburg
> Ben McMillen
>