Re: Where to get 4kv 20ma NST?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steven Ward by way of Terry Fritz <twftesla-at-qwest-dot-net>" <srward16-at-hotmail-dot-com>

I did the GMHEICSLR thing.  I got i think 11.75" 2 times then i saw a bright 
flashing inside of the coil.  Unfortunatley it wasnt a GM coil.  It was 
actually some cheap coil that was used for a few years, a friend gave it to 
me.

But anyway the power level(of the mini coil) isnt 80W , but rather ~ 152 
watts since you remove 1/2 the shunts to make it suppply 38ma rather than 
20.  I can get even more overrated caps!!  How about this: 1 string of 13, 
.33uf 1200v caps for .0253uf at 15.6kv!!  I would think that these caps 
would work great for this little 150w coil!!  Also if we are judging by 
input VA, wouldnt we need to eliminate any possibility of PFC caps??  It 
would really be much easier to use that specific france former.

Thanks Dan, i will go talk to some local shops and see if they have them.  
Wish me luck.  I wont be able to get it for another week or so because i am 
$100 in debt with my parents for some CD caps i ordered.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Where to get 4kv 20ma NST?
>Date: Mon, 23 Sep 2002 07:19:10 -0600
>
>Original poster: "sundog by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><sundog-at-timeship-dot-net>
>
>Well now, this sounds like a fun little competetion!  I've given up on
>claiming the GMHEICSLR cup.  11" is the best I can manage before my coil
>self-destructs (inter-turn shorts in the primary).
>
>    I'll try to dig up a 4/30 (I may have one already, IIRR, may be 6/30).
>
>      To keep it all sane, we should get a list of people willing to be
>involved, choose somebody to organize and judge the results (preferably
>somebody not participating), and set the rules.
>
>    So far, we've limited the supply to 80w input power.  Wow :)  Next, I
>suppose we should set the rules on types of coils allowed.  Is this a
>demonstration for disruptive coils only, or can we get enough competition
>to merit SGTC's, SSTC's, and VTTC's in there?  Coils this small will be
>cheap to make (caps and the transformers will be the most expensive
>parts).   In the interests of innovation, I'd rather set a limit on the
>total input power to be 80w, as measured at the wallplug.  That should not
>include cooling fans for the spark gaps, etc.  Just the power going to the
>transformer.
>
>    Maybe if there's enough interested people, we could organize a bulk-buy
>of 4/20's?  Perhaps get a better price, and level the playing field by
>everybody using the same tranny.  Then it comes down to builder's skill and
>efficiency of the rest of the coil.
>
>    And we'd have to pry Terry away from his OLTC to make us a trophy ;)  
>He
>did such a good job on the GMHEICSLR trophy (which still eludes me!)
>
>Sounds like a blast to me :))
>
>
>Shad
>G5-1203
>
>
>At 12:09 AM 9/23/02, you wrote:
> >Original poster: "Malcolm Watts by way of Terry Fritz
> ><twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>
> >
> >Hi Dan,
> >
> >On 22 Sep 2002, at 20:46, Tesla list wrote:
> >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> ><dhmccauley-at-spacecatlighting-dot-com>
> > >
> > > > Well, seeing that my 1200v 42ls are not going so well with the 
>larger
> > > coils,
> > > > i think that i will join in the competition for the mini coil amoung 
>Gary
> > > > and Dan.  My weak capacitors should work just fine for this power
> > level of
> > > > about 160 watts. I plan on 1 string of 10, .15uf 1200v caps for a 
>nice
> > > > .015uf 12000v cap.  Nicely overrated ;).
> > > >
> > > > So where do you get the 4000v 20ma France NST??  Can you order them 
>from
> > > > somewhere??  Also, do you guys think that .015uf is too big for the 
>4000v
> > > > 38ma supply??  Thats about as small as i want to go, but will go 
>lower if
> > > > needed.
> > >
> > > You can check the Franceformer website for local distributors.  These 
>are
> > > extremely common and everyone probably has them in stock in your area.
> > > They retail for about $25.00 depending on your locale.
> > >
> > > Actually, the 0.015uF is probably a bit small.  The calculated value 
>for a
> > > 4kV, 38mA transformer is about 0.0252uF.  Right now I am running only 
>about
> > > a 0.0112uF, but will soon update to a 0.0252uF as well as try a larger
> > > toroid as well.
> >
> >Can I suggest that a VA rating is a more appropriate platform off
> >which to launch a competition? Franceformers aren't very plentiful in
> >my part of the world.
> >
> >Regards,
> >malcolm
>
>-----------------------------------------------------------------------
>Shad (Sundog)
>G-5 #1203
>"Ever stop to think, and forget to start again?"
>-----------------------------------------------------------------------




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