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Re: win tesla vs. JHCTES

to: Bill

NST's use a magnetic link across the core that will cause the magnetic
field to take a new path of least resistance as the sec is shorted.  The
link is tapped with a small hammer during testing to set it to the proper
full load current and then epoxied in place.  If you tear and NST totally
apart you can move this link for slightly more current, say 75 ma, and
usually without overloading the xmfr on short duty cycles.  Next, drop the
core/coil assembly into a plastic tupperware tank filled with xmfr oil and
you have just improved the performance of your coil as caps in small Tesla
oscillators just "adore" more current.  This will visibly improve your
output spark distance.

You are correct -- NST attached to resonant charging systems do produce
more current, however, if you push them too hard they will fail as they are
only really designed to hit full nameplate potential long enough to ionize
the gas in the neon tube, and then they drop back to 600-700 volts and
serve as a current source to drive the plasma.  In Tesla service they are
called on to continually replenish the cap to full value as dictated by
spark gap setting.  When using NST's it's a good idea to keep total gap to
less than 0.200 or less.  Also be sure to use RF protection between xmfr
bushings and spark gap.  There is considerable information on these
procedures in the archives.

DR.RESONANCE-at-next-wave-dot-net


----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: win tesla vs. JHCTES
> Date: Tuesday, September 15, 1998 4:35 PM
> 
> Original Poster: "Bill Layer" <b.layer-at-vikingelectronics-dot-com> 
> 
> Hi John,
> 
> I guess I need some clarification on something. 
> 
> >Regarding the 60ma NST, this often causes great confusion because
> >a 60ma NST can deliver a lot more than 60ma, if a resonant charging
> >sized capacitor is used.  So if someone says they got let's say a 60"
> >spark from a 60ma NST, they may actually be drawing 120ma or even 
> >more from the transformer.  This helps to explain their results.  The 
> >60ma should be thought of as transformer rating only, rather than an
> >actual amount of current draw.
> >
> >Bottom line, the record for a 60ma NST, and the record for a true 60ma
> >current draw (from a 60ma NST), would be very different animals.
> 
> By all the previous posts I've read, NSTs are current limited to their
> nameplate spec. That is, a 60mA NST will do 60 mA into a dead short. How
is
> the limiting accomplished: inductive or resistive?
> 
> I would believe that higher voltages could be produced, which in turn
might
> constitute higer VA outputs for the same (limited) current. It would seem
> that you are suggesting tht these higher induced voltages will push
> proportionally more current through the sec, when the voltages are
actually
> an effect of the nominal currents...
> 
> Could someone help enlighten me here?>
> 
> 
> >
> >
> Bill Layer, member
> 
> The International Brotherhood of Jazz Dancers, Pastry Chefs and Nuclear
> Technicians
>