neon trannie loading?

From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Sunday, June 21, 1998 1:10 PM
To:  Tesla List
Subject:  Re: neon trannie loading?

to: Jeff

It's not the current that kills the NST's -- it's the fact they are
designed to ionize the neon at 12 kV and then, within a few hundred
milliseconds, drop back to around 600-700 volts and act as current sources
to drive the plasma.  NST's are not made to provide 12 kV for the time
periods commonly used in Tesla oscillator design.  They will work but at
some point usually fail due to small amounts of RF feeding back into the
windings where it is distributed layer to layer due to capacitive effects. 
Many experimenters also buy used xmfrs which compounds the problem.  A good
used potential xmfr will provide a continuous 12 kV and is much more
durable than a NST.  Price is around the same as a new NST.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: neon trannie loading?
> Date: Saturday, June 20, 1998 7:06 PM
> ----------
> From:  Jeff Corr [SMTP:corr-at-enid-dot-com]
> Sent:  Saturday, June 20, 1998 1:33 PM
> To:  tesla list
> Subject:  neon trannie loading?
> I got a flyer here from Franceformer saying that
> neon transformers should be loaded to 75% to 85%
> of the designated max. current.  Ex : a 30ma neon 
> should be loaded to 24ma or 25ma.  If this was true,
> would this not explain why tesla coils kill neons
> fast?  (charging up the cap would be like a temporary
> short, pulling much more than 25ma, right?)
> Could this also be why resisitors in series with the
> chokes help save neons?  Since adding resistors, I
> have not ever lost a neon, and was getting very good
> sparks.
> Any thoughts?
> Jeff Corr
> 2114 Monitor
> Enid, OK 73703
> http://www.harvestcomm-dot-net/personal/corr/