Re: Rewinding NST`s

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

Original poster: "Brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

WoW, nice work! rewinding fine wire is a hard job and takes great patience!
Many people suffer the neon death from used transformers...my brother's coil
is using Obit for his and they dont last too long-the reason they were
replaced because erratic or old or tar or sealant is cracked allowing
failure. But he gets them for nothing and when it dies he sends it back to
the junkman(who doesnt care if they work or not). cul brian f.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 10, 2002 10:07 AM
Subject: Rewinding NST`s


> Original poster: "Nebojsa Kovacevic by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <morfeus-at-EUnet.yu>
>
> 73
> Hello All!
>
> I can see that most of you had problems, like I do, with burned NST`s.
> The problem can be salved in many diferent ways as I can see from all of
> you. I have had problems with two HV 15kV/30mA transformers lately. They
> are now both rewinded by me. Now, the fact is that they are not NST`s.
> Some other category which is not very important here.
> Anyway, both transformers burned out after a short while of my
> experimenting. When I opened them, I expected to see tar, but there was
> some kind of plastic, like something in between the plastic and the wax.
> It was really easy job to chop up and not damaging the
> windings(fortunatly for me). Then I unwind the secondary, which is very
> strange loking, it consists of two windings, separated by plastic, one
> is for + and the other one is for -. I saw where the problem was, and
> wind it again all over, it took me very long time to do that with
> hair-thin wire. But, then I have had problem with insulator. I tryed
> oil, all kinds of lastic, it was very hard to insulate that transformer
> again. Then I saw where the problem was. The secondary is connected to
> the body of the transformer with a wire that connects few first turns of
> wire of the secondary, to the body of the transformer, that is to the
> ground.
> First thing was to disconnect that wire and try again. It worked
> perfectly. I even got some more power(which I determined by the arc
> lenght, and the streamers produced on my TC), because much ofthe power
> was losted in that ground connection, which is, I am almost positive
> now, not needed.
> The main thing is that right now I don`t have absolutly no insulation in
> my HV transformer, and have had no problems of any kind what so ever. I
> have windings, that can be seen if you look in the transformers box. I
> tested that tranny for an hour continously on my TC, and after that
> period, I got some heating, which can not be compared to the heating I
> have had during the previous period. The other one is also done this
> way.
> After these modifications, my coil is working perfectly, and I only need
> to 'cool down my ears' after a few minutes period, the fact that is very
> well known to you all-noise.
>
> Regards,
> Nele   YU
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