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RE: Iron transformer positioning under the primary experiment

Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>

Hi Dr:

I'm curious why you suggest that a Terry filter is of no value if it's
under the primary coil.  If the NST(s) were located remotely from the
coil assembly, then I'd agree that locating the filter under the primary
is bad, but only because it's distant from the NST's.  But if the NST is
also close to the primary, I don't see how the filter's proximity to the
primary compromises its effectiveness.  Or were you just cautioning not
to locate the filter far from the NST's?

Regards, Gary Lau

> Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
> It's not only the metal proximity that should be considered.  Any
> closed turns in a transformer coil that are under or near the primary
> coil will pick up spurious spikes and may damage the transformer or
> induce these nasty very low microsecond spikes into the 60 Hertz
> power line.  Also, directly under the primary, a Terry filter really
> is of no value.
> It is easy and cheap to simply enclose the power transformer and
> Terry filter in a suitable enclosure 5-6 feet away from the coil.  No
> need to take chances.  It is simply poor engineering practice.
> Dr. Resonance