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Re: [TCML] NST shunt removal vs more NSTs
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?
----- Original Message -----
From: "bartb" <bartb@xxxxxxxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Tuesday, June 10, 2008 10:30 AM
Subject: Re: [TCML] NST shunt removal
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.
b alex pettit jr wrote:
Hi Bart, et.al,
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 ?
I was hoping they would be more easily removed. I hate to potentially
damage a fully functional NST.
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,
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