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Re: [TCML] Variac



Hey Phillip...

starting at 0 volts and bringing it up to operating voltage (120vac) is fine as long as the NST has a load attached to it. As far as going into the 125+ range with no load attached can be a bit hard on the insulation. NST's are designed to put out the nameplate voltage for brief periods of time when the neon tube is starting up ( not yet running) but once the tube strikes and lights up, the resistance is pretty low anyway ( something about negative resistance in a plasma). Kinda makes you wonder about all those NST's trying to fire off broken neon lites and how long they last in that situation...

Scot D

Imagine in the moving "Castaway" with Tom Hanks that the package he was saving for 5 years was a Solar Powered Satelite Phone........



Phillip Slawinski wrote:

With all this talk about how weak the insulation is on NSTs I just assumed
it was a bad idea.  Is it okay as long as the NST isn't running open?

On Wed, Jun 25, 2008 at 9:23 AM, Lau, Gary <Gary.Lau@xxxxxx> wrote:

I've never heard that; why should that be a problem?

Regards, Gary Lau
MA, USA

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Phillip Slawinski
Sent: Wednesday, June 25, 2008 10:12 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Variac

Isn't it a bad idea to ramp up the voltage with an NST?
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