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Re: [TCML] NST shunt removal

I have taken a perfectly functional NST and depotted it.  The results
can be rather rewarding.

On Mon, Jun 9, 2008 at 7:30 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:
> 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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>>
>
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