Re: [TCML] Re: Upgraded NPT to 15/60

[futuret@xxxxxxx]

Joe,

For a given power level and spark length, arcs will be more likely to hit the strike
rail if the toroid is close to the strike rail as you suggested.  Your idea of raising
the toroid is the standard fix for the problem.   Of course if the secondary is rather
short, and the arcs are long, they'll be more likely to arc down and hit the strike rail
anyway, maybe.  If the diameter of the strike rail is large relative to the toroid diameter, that
may make strikes to the primary more likely also.  Some folks like to put a smaller
toroid under the main toroid, which allows for raising the main toroid more than
otherwise.  You could probably use your 12" toroid.  I used this method on my TT-42 coil.  
If you raise the main toroid too much
above the secondary, without an extra toroid or corona ring just above the secondary,
then a lot of corona may appear at the top of the secondary.  It can also help
to lower the strike rail, or eliminate it.  Many folks don't use a strike rail since
it tends to attract the sparks.  Some folks put a large plexiglas disc over the
primary instead of using a strike rail.

Cheers,
John




But to have the arcs "only" hitting the ring is sort of self-referential.  I imagine this is a geometry problem.  I'm wondering if it 



could be solved by raising the toroid above the secondary a couple inches with 

an insulator and electrically connecting it via a strand of 26 ga magnet wire.  

Perhaps this additional "distance" would encourage to find a ground path 

elsewhere, and perhaps improve the light show.

Thanks in advance for any ideas.


Joe





 
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