[TCML] NST shunt removal vs more NSTs

[David Nelson]

Bart/group

I have several NSTs the same. Is there an advantage to removing shunts as 
opposed to just using more NSTs in parallel to increase current?

Dave Nelson
----- Original Message ----- 
From: "bartb" <bartb at classictesla.com>
To: "Tesla Coil Mailing List" <tesla at pupman.com>
Sent: Tuesday, June 10, 2008 10:30 AM
Subject: Re: [TCML] NST shunt removal


Hi Alex,

If the NST is in good working order, I would personally not modify it.
They are very easy to damage during the process. The only reason I
modified my NST is because I had killed it and at that point there was
no harm in going for it.

Bart

b alex pettit jr wrote:
> Hi Bart, et.al,
> &nbsp;
> So, from this, it seems that a full disassembly of the
> transformer ( coils from core ) must be performed to
> gain access to the shunt pieces ?
> &nbsp;
> I was hoping they would be more easily removed. I hate to potentially 
> damage a fully functional NST.
> &nbsp;
> Thanks,
> Alex P
> &nbsp;
> *********************************
> My NST was a Franceformer 12/60. I burned a secondary. Well, I heated and 
> removed the tar from the NST. I then cleaned up the secondaries, 
> primaries, core, etc.. When I put it back together, I decided to take 1/2 
> the shunts out (exactly). The shunts were made of 4 bricks positioned 
> around the NST core. I simply removed 1/2 of each brick (which were square 
> laminations). I simply counted the total laminations in each brick and 
> removed 1/2 of those. I expected at the time my current would double. I 
> expected a 120mA NST. Guess what, I got a near 200mA NST out of the 
> ordeal. Very surprising to me! The shunts are not linear to the current 
> limit of the core. It is a differential increase in current, and as I 
> realized that, it was that point that I decided to recommend no more that 
> 1/2 the shunts removed from a depotting experience. Just a recommendation 
> (if you feel compelled to remove more, by all means, have fun with it). 
> About all I can say is that if you
>  remove 1/2 the shunts out of a Franceformer 12/60, you'll do better than 
> double the current. Take care,
> Bart
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