From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: Friday, June 12, 1998 12:46 PM
To: Tesla List
Subject: Re: Gap setting?
You can run a larger gap up to 0.200 inches but anything larger (total gap)
will spell certain doom to your NST. They are not made to provide their
full rated output potential for a long period of time -- only long enough
to ionize the gas in the neon tube and then they drop back to around
600-800 volts and just serve as a current source.
When I mentioned the .045 inch setting I was referring to the initial
"tuning" conditions for the coil not its normal in tune operating mode.
Normal is .150 to .200 inch setting with only 3 total gaps necessary for a
30 ma drive current. 5 gaps work best with a 60 ma dirve and 7 gaps work
great with 120 ma drive. Anything more is "ok" but not necessary for good
performance. A small 150 - 200 CFM blower fan adds performance with a 60
or 120 ma xmfr. The vacuum cleaner suction type gaps also work great with
small to medium size systems.
> From: Gary Lau 11-Jun-1998 0917 [SMTP:lau-at-hdecad.ENET.dec-dot-com]
> Sent: Thursday, June 11, 1998 8:34 AM
> To: tesla-at-pupman-dot-com
> Subject: Gap setting?
> >From: D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
> >With a 30 ma NST you only need 2 or 3 gaps. Set at .015 inches on each
> >for .045 inch total. Try this first and see if it runs with this
> I don't see how the gap setting is derived from the power supply current
> rating. I would think that it is voltage-dependant, not
> current-dependant. Rather, I would think the current rating would
> dictate the required "beefyness" of the gaps, how much heat it must
> dissipate, while the voltage rating would dictate the gap spacing. I
> know that for my 15KV/30mA coil, that going from 5 to 10 gaps of .03"
> each, made a world of difference in performance. The suggested gap of
> .045 sounds way too short, IMO.
> Gary Lau
> Waltham, MA USA