Whoops I was wrong sorry, they are 30ma but I was trying to find a HV
rectifier diode for 15kv 250ma and got the two mixed up.
I have all 3 20 years and they have been used for less than a month total.
I got them for $20 each. =)
On Sun, Aug 23, 2015 at 3:33 PM, Gary Lau <glau1024@xxxxxxxxx> wrote:
> Three 15KV 250mA NST's? Wow! I've never heard of an NST more than 120mA.
> If you're correct about the current rating of those beasts, you'll need
> quite a large capacitor array to fully unitize so much power, and building
> an MMC might be pushing the limit on when it makes sense to buy a
> professional pulse cap rather than the MMC approach.
>
> > I especially am interested in inductor usage to prevent spikes back to
> the NST.
>
> There was a time when it was thought that RF chokes between the active TC
> components and the NST was useful in protecting the NST from ill-defined
> threats. More recent analysis suggests that chokes may cause more harm
> than good. My analysis is detailed here:
> http://www.laushaus.com/tesla/protection.htm
>
> Current thinking is that an R-C filter is the best protection, couples with
> MOV surge suppressors and correctly-set safety gaps, collectively known as
> a Terry filter.
>
> Regards, Gary Lau
> MA, USA
>
>
> On Sat, Aug 22, 2015 at 5:10 PM, Matthew Sweeney <msweeney23@xxxxxxxxx>
> wrote:
>
> > Hello, I recently joined this mailing because I didn't know it existed. I
> > don't make tesla coils any more but I produce large Van De Graff
> generators
> > and simple kelvin thunderstorm projects to amuse myself and keep my
> nephews
> > amazed.
> >
> > Anyway I visited my local Axe-MAn today and learned that they have a
> > customer named Mike Delosier who lives in minnesota and has some
> > impressive coils.
> >
> > I am hoping very much to contact Mike but I have not been able to find
> his
> > e-mail address. I don't see any recent posts with his name so maybe he is
> > not a member anymore?
> >
> > So, if anyone knows him, I would be delighted to send him an email.
> > Alternatively he can send ME an e-mail as to be less intrusive:
> > msweeney23@xxxxxxxxx
> >
> > I did build several decent coils over 20 years ago with home made plate
> > class capacitors and a horribly inefficient stationary spark gap. I
> didn't
> > have any protection circuitry in place but somehow my HV transformers
> > survived, however my capacitor eventually exploded.
> >
> > Now I have three perfect 15,000v 250ma NST's just sitting waiting for a
> > purpose - so I think it's time to start planning a new build. I have
> never
> > built a proper solid state coil and am considering this option. But a
> > traditional rotary spark-cap coil with high-voltage capacitors would be
> > much less effort. The secondary will be 5 Feet and using enameled magnet
> > wire.
> >
> > I'm looking for good sources of (cheap) high voltage capacitors and much
> > info on recent developments in the field. I especially am interested in
> > inductor usage to prevent spikes back to the NST. Also I need some advice
> > on secondary wiring cable is there a preferred variety for recent coils?
> > Ill use copper tubing for primary. I may also build my own rolled
> > capacitors but I'm thinking obtaining newer HV caps in a bank may
> actually
> > be cheaper.
> >
> > If there other members in the Minnesota/Wisconsin I would also like to
> > connect. I'm desperate to find a powerful coil to blow my nephews minds
> =)
> >
> > Thank you for any help you can provide. I'll be reviewing the lists
> looking
> > for new info also but direct contact for any suggestions would be
> welcomed.
> >
> > Regards,
> >
> > Matt Sweeney
> > _______________________________________________
> > Tesla mailing list
> > Tesla@xxxxxxxxxx
> > http://www.pupman.com/mailman/listinfo/tesla
> >
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla