Re: Ugly Carbon Track in Terry Filter (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Mon, 18 Jun 2007 18:07:11 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Ugly Carbon Track in Terry Filter (fwd)

Hi James,

Yep, the carbon composition of the plastic crossed my mind as well. I 
have the same box type that I'll replace it with but this one is orange 
in color. So, if it was carbon, that should take care of it.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Mon, 18 Jun 2007 08:25:36 +0100
>From: James Howells <james@xxxxxxxxxxxxxxxxxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Ugly Carbon Track in Terry Filter (fwd)
>
>Two replies in a day  - from me
>BLACK PLASTIC !
>I used to work in the plastic Moulding game and some black plastics can /do 
>have carbon in them
>Even if they don't, contamination from previous runs is easily hidden by the 
>strong colours  - purging of the previous material  is not taken to the 
>extent it would be with white , yellow or other colours.
>
>I used a IKEA Teflon chopping board for my TERRY FILTER and still got 
>massive HV tracking .................... I marked it out with a soft lead 
>pencil.
>http://uk.pg.photos.yahoo.com/ph/jmshwlls/detail?.dir=eea3re2&.dnm=4718scd.jpg
>http://uk.pg.photos.yahoo.com/ph/jmshwlls/detail?.dir=eea3re2&.dnm=4718scd.jpg&.src=ph
>Oh the follies of youth ( 59)  and inexperience
>Protected by www.SpamJab.com {UgzndUInruKjv2Cy9r}
>
>
>
>----- Original Message ----- 
>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: <tesla@xxxxxxxxxx>
>Sent: Monday, June 18, 2007 3:10 AM
>Subject: Ugly Carbon Track in Terry Filter (fwd)
>
>
>  
>
>>---------- Forwarded message ----------
>>Date: Sun, 17 Jun 2007 18:33:45 -0700
>>From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
>>To: Tesla list <tesla@xxxxxxxxxx>
>>Subject: Ugly Carbon Track in Terry Filter
>>
>>Hi all,
>>
>>Last week while running the "you know what" out of one of my coils, I
>>killed a Terry Filter [TF] which was physically installed on top of the
>>NST. The TF was mounted in a black plastic box. The wall thickness of
>>the box was 1/8". It worked well for quite some time, but all of a
>>sudden "poof". I powered the coil down immediately of course. Then to
>>help troubleshoot the problem, I powered the coil back up looking for a
>>sign of failure. Well, a bright orange glow inside the TF box told me
>>that was the problem area. I removed the TF and the coil ran great once
>>again.
>>
>>Today, I performed an autopsy on the TF. I originally opened the box up
>>and saw what I thought was burned areas around MOV's, resistors, and
>>caps. But today I dissected the TF and realized the assumed problem area
>>was just 2nd hand soot from a carbon track which occurred in the plastic
>>box itself. The actual components were fine.
>>
>>Here's a pic of the disassembled TF:
>>http://www.classictesla.com/temp/Img_3816.jpg
>>
>>The board I used is in front, the Lid to the box included the RF ground
>>electrodes and large resistors, and the box itself is behind it all (not
>>really visible in the pic). It's just an empty box that the board lays 
>>into.
>>
>>Here's a pic of the bottom side of the lid showing the carbon track
>>(it's a good one):
>>http://www.classictesla.com/temp/Img_3818.jpg
>>
>>Pretty obvious the problem, eh? That carbon track is about 2 inches
>>long. Here is what I think occurred and I don't think the box had
>>anything to do with it (sort of). I was running full power. I think a
>>topload strike hit the TF putting an very high voltage at the TF capable
>>of causing the carbon track. I've done the same thing with an RSG
>>support made of G10 and that carbon track was very similar but about 5
>>inches long.
>>
>>These things happen. No big deal. Easy enough to repair.
>>
>>Just wanted to share one of those odd moments.
>>
>>Take care,
>>Bart
>>
>>
>>
>>
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