Re: Fraceformer internal repair? (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Fri, 25 May 2007 15:48:31 +0000
From: David Rieben <drieben@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Cc: drieben@xxxxxxxxxxx
Subject: Re: Fraceformer internal repair? (fwd)

Hi Matt,

I don't have a lot of experience with "depotting" NSTs
and what little experience I do have has pretty well turned
out disasterous. Reading your posting reminded me of my
"bad times". I finally came to the conclusion that a "dead"
NST just isn't worth that much trouble to "resurrect". I do be-
lieve that your assumption is correct about repairing the high
voltage winding connection to the coil bobbing. Of course,
once again, it is rather challenging, at least to me, to repair
and solder nearly hair fine wire, but you may not be as dex-
terously challenged as myself ;^)

David Rieben

-------------- Original message -------------- 
From: "Tesla list" <tesla@xxxxxxxxxx> 

> Original poster: List moderator 
> 
> 
> 
> ---------- Forwarded message ---------- 
> Date: Fri, 25 May 2007 03:48:40 -0400 (EDT) 
> From: M G 
> To: tesla@xxxxxxxxxx 
> Subject: Fraceformer internal repair? 
> 
> p {margin-top:0px;margin-bottom:0px;} 
> Hello list, this is mostly a re-post of my last post due to receiving no 
> replies, which seems to be getting more common for myself. I don't know 
> if my titles are just badly worded, or something else is going on here, 
> but if someone could please answer that would be great. The question has 
> been made to stand out if you would rather not read the rest. 
> 
> Thank you. 
> 
> " I was finally able to remove the core of the 15kv 30ma NST I've been 
> working on. It's been a long process. First I heated the core in oven, 
> which removed most of the tar, but not the tar holding the core in place. 
> After I soaked the opened case in kerosene for a little more than a week, 
> but this failed to remove the tar holding the core in. I then let the 
> case dry out for over three weeks, and finally today I heated the case 
> again, but in the grill this time. 
> 
> After the core budged I set it on some aluminum foil. When I went to 
> trash the foil it still had some really hot tar on it. This ended up 
> accidentally getting on two of my fingers. It burned both areas really 
> good, and I couldn't remove the tar until it cooled. Make sure to use 
> some thick gloves when doing this kind of work, because burn! s really 
> are not fun. 
> 
> ----------------------------------------------------------------------- 
> Removing the core also tore off one of the high voltage 
> windings connection, but I believe this may be a simple fix. It seems the 
> connection was just attached to a metallic plate on the winding. If 
> anyone can verify this for me that would be great. The NST is a 
> Franceformer. 
> ----------------------------------------------------------------------- 
> 
> Well, considering I am typing with one and half hands I think I'll end 
> this here... 
> 
> Thanks, 
> Matt G." 
> 
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