Re: NST rebuilds/success #1

["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>

HI,

thanks for that tip about melting them.  After fooling around with a 15/30 
that had a core that i couldnt concieve a way to separate, i jumped on my 
15/60 france.  Well after about 12 hours or so, im left with:  tar imbedded 
fingers, tar covered tools, a few stains on the garage floor, a sore wrist, 
and a sweet 1000watt++ PSU.  The arc is so fat and extremely hot!  I cant 
wait to begin my newest coil.  I plan to go all out and make it with this 
1kw psu.  If anyone is looking at unpotting/rebuilding NSTs, try to get 
France, they are far easier to work with that most others ive taken apart.  
So when doing the final clean up of the core and coils, i couldnt fit all 
the shunts back in with the added insualtion.  Sooo, the transformer draws a 
nice 12A  ;).  I can already see the 3.5 footers in my mind :).  I will aslo 
be considering making another coil psu with 3 or 4 15/30 rebuilds, with a 
few shunts missing. OR crack open another France 15/60 for a dual supply of 
15/~140ma(I get excited just thinking about it)  I like the idea of getting 
use out of so many transformers, but all that depotting really takes it out 
of ya!!  Ill try either gasoline/ karosene or heating them out of the tar 
(wish me luck!).  Oh and the transformer i just rebuilt had one dead half! I 
just check for continuity with a ohm meter, and if both coil look ok i go 
for the rebuild.  I would think that if the coil had broken down through the 
coil, it would burn the winding and show an open circuit.

Steve Ward.


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: NST rebuilds
>Date: Wed, 17 Jul 2002 18:15:11 -0600
>
>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><megavolt121-at-attbi-dot-com>
>
>Steve-
>  Try throwing them all on a heat source to heat them up
>and melt the tar. If there was carbon tracking in the
>tar, that will get rid of them. That's the easiest thing
>you can try. If they still dont work, then you can think
>about getting out the old chisel...
>
>-alan
> > Original poster: "Steven Ward by way of Terry Fritz 
><twftesla-at-qwest-dot-net>"
> > <srward16-at-hotmail-dot-com>
> >
> > HI,
> >
> > Ive rebuilt transformers before and had success with each(I knew what 
>was
> > wrong with each tranformer, ie, i blew them with a TC).  Recently, i 
>picked
> > up about 15 busted transformers at a sign shop.  Unfortunately my friend 
>was
> > there earlier and took most of the 60 ma units.  But anyways, i was 
>noteing
> > some test results with just testing the transformers(if youre lucky some
> > will work! i was lucky with one).  So here are some characteristics of 
>these
> > transformers.  All of them are magnetek(jefferson), or france.
> >
> > 1.  One or both windings show no sign of arcing.
> >
> > 2.  One side or both show very weak tiny sparks(1/20").
> >
> > 3.  One side is strong, the other dead or very weak.
> >
> > 4.  or a combo of any of these.
> >
> >
> > Now, im wondering if anyone can tell me whether or not these are signs 
>of a
> > good rebuild(tar broke down), or a bad pointless rebuild(winding broken
> > down).  Id really love if i can get a few of these 15/60s working again. 
>  So
> > far ive been working on an Allonson 15/30, for a smaller coil and for
> > practice.  Also, does anyone know if a broken down winding has any 
>specific
> > characteristics??  Any other info anyone can give will be helpful.
> >
> > Steve Ward.
> >
> >
> >