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Re: grounded primary?

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Beans45601-at-aol-dot-com>

The sparks are about 2". I don't know anything about the coil except that the
transformer appears to be 8-10Kv. I can's get access to the caps. It is a
roadery spark gap. It appears to be made by someone who knew what they were

> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> Hi Adam,
> What kind of NST is it?  Could you give more detail on the coil?
> I can think of some situations where this may be "right" but no two Tesla
> coils
> seemed to be built the same way.  So, we have to consider the whole story in
> how this "one" is constructed.
> You say the coil is "poor" but how does it relate to John's formula of spark
> length in inches:
> L = 1.7 x SQRT (input power)
> Cheers,
>         Terry
> At 12:00 AM 5/12/2002 -0400, you wrote: 
> >
> > I was looking at the TC at the children's museum that I work at and I
> noticed
> > that the primary coil was grounded to the NST case. I have never seen (or
> > herd of) this done before. Is this the reason that the coil is getting such
> > poor performance?
> > Thanks
> > Adam