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RE: Iron transformer positioning under the primary experiment

Original poster: "Mccauley, Daniel H" <daniel.h.mccauley@xxxxxxxx>


I'm not sure i agree with this.  As an experiment, i placed a MOT next
to my DRSSTC III coil and the core was SMOKING hot after only a few
minutes of run time.  I suspected this would occur, as this was the same
thing that happened with my dual 833A coil several years back.

Not sure how much this would effect performance, but energy is being
loss to the core.


On a conventional lossy spark gap coil, even a very close MOT in a
bad position would not be noticed.  We often see coils with
transformers and such under the primary.  It might be the case that
their added losses are not too great.  But the open core MOT will
reject eddy and sorted turn currents.  That is not the case for say a
NST cover.