Re: [TCML] Coil Died

[Tim Flood <tfloodrr@xxxxxxxxx>]

Thanks to all for your replies.

Dave, the thickness of the coil form is 3/4".

I disassembled the secondary coil to inspect the interior and found no
signs of carbon tracking. Also ran a rag through the inside just in case
there was any contamination. There did not appear to be any damage to the
secondary winding.

I did remove the MMC string and re installed the door knob caps. As soon as
I began turning up the variac little sparks developed along the length of
the sec. winding. This sparking stopped as the voltage increased. The TC
then performed a little better with the door knobs back in - then quit as
far as producing arcs from the toroid.

Another bit of information. When the discharges from the top load quit, the
firing of the static spark gaps seemed to drop in voltage as though the
variac had been decreased by 50%. I also received a very mild shock from
the variac body.

I did not change anything that would effect the coupling, but I will try
some adjustments. This coil has always been a good performer. The
performance has been slowly dropping off over the past year, though.
Thought I had the reason why when I found the cracked primary ribbon. Now
it acts like a completely different coil.

Could one of the two paralleled NSTs be contributing to the problem? I'm
about ready to start over and build a completely new one, but I need this
one in the near future.

Please keep the advice coming.

Thank you,

Tim Flood





On Wed, Oct 9, 2013 at 8:39 PM, David Thomson <
tcbuilder@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, Oct 9, 2013 at 3:57 PM, Tim Flood <tfloodrr@xxxxxxxxx> wrote:
>
> > Thanks. One thing I maybe should have mentioned is that PVC tube wall
> > thickness is about 3/4". But I will disassemble and take a look tonight
> for
> > any signs of arcing inside.
> >
> Are you saying you have 3/4" PVC between the primary and secondary?  Or is
> this the thickness of the secondary coil form?
>
> Dave Thomson
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