I think that I have figured out why your GF NST is working. With a standard
SGTC the start of the discharge looks like a dead short across the NST
secondary. (Pop!) The resistors dissipate enough power to keep it from
looking like a short to the NST. The only drawback is the power eaten by
the resistors is not available to the TC.
On Fri, Nov 30, 2018, 11:39 AM Douglas Johnson <doug379306@xxxxxxxxx> wrote:
> Hi Ed. Standard TC setup, except the {1K 25 Watt power resisters} are
> connected between the NST HV leads and safety gap lugs on the coil.
> Please understand, I have little technical knowledge here I was just
> playing around and it worked! I would hope some of the more technical
> minded members on the list would do a little trial and error with this, it
> could possibly open a new source of usable NST's, ie [GF NST's] for small
> and moderate coils.
> These power resisters are inexpensive as are aluminum heat-sinks if needed.
> I wish I had a 12 or 15K GF NST to test out but I do not.
> Thanks for your reply.
> Doug
>
> On Fri, Nov 30, 2018 at 9:05 AM Ed <evp@xxxxxxxxxxx> wrote:
>
> > What's your circuit?
> >
> > Ed
> >
> >
> > On 11/29/2018 6:53 PM, Douglas Johnson wrote:
> > > Gary, I am far from technical when it comes to this stuff as I am sure
> > you
> > > can see by a lot of my questions! It was just a fluke that I tried this
> > out
> > > of boredom. All I know is that it works. Take the resisters out, and GF
> > > pops.
> > > The resisters are similar in appearance to these >
> > >
> >
> https://www.ebay.com/itm/2Pcs-Wirewound-Ceramic-Cement-Resistor-0-5-1K-Ohm-5-25W-Watt/352350026175?hash=item5209b2b9bf:m:mowqAUe59odwZoiyCa7jxDg:rk:38:pf:0
> > > Maybe it works because, in my ignorance, I didn't know it wouldn't😉
> > > Doug
> > >
> > > On Thu, Nov 29, 2018 at 9:20 PM Gary Lau <glau1024@xxxxxxxxx> wrote:
> > >
> > >> I can't comment on your GF working in a TC. I've not personally tried
> > it,
> > >> but the prevailing wisdom is that it typically doesn't work in a TC
> > >> application. I wonder if higher voltage GF NST's are more affected
> than
> > >> lower voltage ones?
> > >>
> > >> The resistors - 1KOhm, 25Watt, 210-what? What are these for? It
> sounds
> > >> like they're intended to be part of a protection network, except that
> > >> resistors must be used with capacitors to form a low-pass filter
> > network.
> > >> By themselves or with safety gaps, resistors serve no protective
> > purpose.
> > >>
> > >> Regards, Gary Lau
> > >> MA, USA
> > >>
> > >> On Thu, Nov 29, 2018 at 6:22 PM Douglas Johnson <doug379306@xxxxxxxxx
> >
> > >> wrote:
> > >>
> > >>> I had a 6K GF NST laying around and decided to see if I could use it
> > on a
> > >>> small TC. I ran a 1K 25w210 wire wound resistor between each leg of
> the
> > >> NST
> > >>> and the safety gap, it worked just fine. I switched the GF 6kv NST
> > with a
> > >>> non GF 6kv nst and the coil output was identical.
> > >>> I was always told that a GF NST would not work for a TC??
> > >>> Resistors are holding up ok.
> > >>> Comments please
> > >>> Doug
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