Re: First light with new MMC PLEASE HELP!!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Greg,

On 15 Sep 2002, at 12:49, Tesla list wrote:

> Original poster: "Mr Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
> 
> Hello all,
> 
> I tried the new MMC. The results can be seen at:
> 
> http://www.geocities-dot-com/gregjpeters/tesla.html
> 
> Go to the last picture.
> 
> I don't know what happened. This is the second secondary I have fried 
> with this coil. There were no racing arcs visible. The tuning was 
> pretty rough I guess. Only the turn in the photo was damaged. It is 
> about 1" from the bottom of the secondary. The rest of the coil is 
> fine. The toroid was massive - 12"x48"  I was getting 10-12 foot arcs 
> at this point, though you wouldn't think so from the photo. Any ideas 
> to what is going on? I couldn't see any primary-secondary arcing at all.

Current has to be the culprit and my guess is that a shorted turn 
resulting from voltage stress between turns is most likely. What kind 
of wire are you using and what is the insulating coating? I presume 
the coil is closewound (nothing wrong with that per se)?

Regards,
Malcolm