I once had a bad primary coil to cap arcing problem that was cause by a
carbon trace that burned itself through the framework of my 4 inch coil.
Not just an inch or two either. I followed the arc and it traveled an inch
through the air from the cap to the frame, then about 10 inches through the
plywood frame (horizontally, between lamination's) to the point where the
pri coil passed down below.
I was able to find the entry and exit points because all my stuff is white,
if it were black I wouldnt have figured it out so fast.
The original cause was a steel screw that attracted energy from the cap,
even after removing the screw that carbon trace was a very favorable path
for energy from the tank circuit.
I have since designed a lower profile MMC and it is long longer an issue.
Perhaps the arcs are originating from a place less obvious.
If it isnt an issue of component to component arcing, perhaps you need to
tank your MOTs in mineral oil.
On Wed, Jul 28, 2010 at 10:57 PM, Scott Bogard<sdbogard@xxxxxxxxx> wrote:
Hey Guys,
So here is a new one that has me stumped... My 4-inch coil burned a
MOT (no uprise there) so I replaced it, to keep the coil from arcing to the
primary and capacitor etc, I hung a grounded wire off the base so any
downward reaching arcs hit it instead of the works (and it does the job
quite well.) Here is the bizarre thing, sometimes (most of the time in
fact) when it hits the wire, I see arcing in the MOT windings to core, it
started as high voltage secondary coil type arcing racing all over, but over
time the windings are actually catching fire inside on one of the MOTs. I
cannot believe but it is still running. None of the wires were connected, I
tried grounding the MOTS and nothing has changed, I'm using only two, what
is going on here? My base is wood painted with black paint, and one MOT has
shunts removed, the other doesn't. I don't know what else to say, it's
never done this before...
Scott Bogard.
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