Re: Where to get 4kv 20ma NST?

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

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Shad,

On 23 Sep 2002, at 7:19, Tesla list wrote:

> 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 :))

I think Dan said he modified his transformer to give 4kV at 38mA so 
the allowable power rating just went up to 152VA. ?  If so, my 
5kV/30mA transformer appears to be in the running.

Regards,
Malcolm
 
> 
> 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?"
> -----------------------------------------------------------------------
> 
> 
> 
>