Re: [TCML] Coil Died

[Greg Peters <greg.j.peters@xxxxxxxxx>]

Btw Tim, I would check those NSTs if you haven't already. Check that you can pull a similar sized arc off each HV terminal to ground. Make sure you use the appropriate insulation to protect yourself though!

Sent from my phone

> On 11 Oct 2013, at 1:14 am, Tim Flood <tfloodrr@xxxxxxxxx> wrote:
> 
> 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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