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RE: blown NST's
I recently cooked my sync motor, so I grabbed DC motor (thanks again,
Dave!), and fired that up -at- ~500bps. Ran it for a decent while on a variety
of coils, and so far have no ill effects on the tranny. The saftey gap I
set in a little bit (gets a bit of purple fuzz on the electrodes on just the
NST). I never ran the gap below 2k rpm's, and found 2 spots spinning up
that it definately "wasn't happy with", because the saftey would fire a few
times. I'm running an LTR cap, but the 9/60 seems to charge it up just
fine. I do have to say, running the gap at 100% on the variac, the
streamers just go *wild*. All over the place. Not really any longer, but
they move a lot faster. Looks really cool. I am fully expecting to cook
this NST sooner or later, but maybe the high breakrate won't kill it.
Input? Ideas? Suggestions?
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, September 07, 2000 10:04 AM
Subject: Re: blown NST's
Original poster: FutureT-at-aol-dot-com
In a message dated 9/6/00 1:53:45 PM Pacific Daylight Time, tesla-at-pupman-dot-com
> Original poster: "Richard Barton" <richardbarton-at-caving5.freeserve.co.uk>
> Hi all
> For around 4 years I've used 3 NST's (12/30 each) hooked up
> in parallel, using a static gap, with no problem. Recently I build a
> gap..... now all three NST's seem to have blown !
> They are all shorting to the metal case internally.... one of them has a
> real bad DEAD short,
Running NST's with a normal async (non-sync) rotary gap does
tend to destroy them quickly. I've had no problems when using
synchronous rotaries at 120 bps however. The use of an LTR
sized cap is probably safer too.