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Should I use a 4" or a 6" secondary? and a few more questions.

I'm triing to make up my mind on a few last details before I begin the 
construction of my first coil:
I have 3 12K 60Ma NST's Thanks to Trent Mullins (mint franceformers!)
:-)  that I will be using as a power source.  I will start off with a single 
NST and parallel as I feel more comfortable.  My question is should I be 
using a 4" PVC form with 24 Guage wire or a 6" form with 22guage wire.   The 
4" route is cheaper and a little easier to obtain. But will the 4" handle 
the power of 12K @ 180 ma? Or will I get better output with a 6" form.  
Second, if I build the coil properly, what kind of spark length output can I 
expect at 12K60ma, 12K@120ma & 12k@180ma
using a RQ style SG?  Just looking for a ballpark, I know there are many 
variables.

The other concern I have is smoking my transformers.  They are so mint I 
afraid to smoke 'em. But I know its part of the game, and I have been 
reading so much about protection circuits and filters for NST's I'm confused 
beyond belief!  The only thing I feel sure of is a saftey gap.
I'm afraid to ask the next question!:) Should I be using an L-C filter or 
R-C filter? gulp!
Thanks
Bob



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