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2 primary coils

I have 3 neons that are 15K at 30 ma and also 3 neons at are 12K at 30 ma.  I am using the 15K neons connected in parralled for my TC.  I would like to have some more power but can not connect the 12K neons in parallel with the 15K neons.

I have several primary coils and several secondary coils in my shop.  I was wondering what would happen if I used what I already have to make 2 completely seperate power supplies to drive the same secondary coil.  

I used one15K neons with a flat primary 6" ID by 30" OD 3/8" copper spaced 3/8" apart.  I don't use this primary anymore because I have better luck with the helix wound primary.  I used a Richard Quick spark gap 9 copper tubes in a 4" PVC pipe with a fan.  One .008 uf rolled poly oil filled capacitor.  Probably too much capaitance but I don't want to risk 2 neons in parallel just in case this does not work and it self distructs.

I used one 12K neon with a 30 degree helix primary 6" ID by 30" OD 3/8" copper spaced 3/8" apart.  I used a Richard Quick spark gap 9 copper tubes in a 4" PVC pipe with a fan.  One .008 uf rolled poly oil filled capacitor.  Again too much capacitance but it is all I have.

I placed the helix primary on top of the flat primary with a 1" space between them at the center.  I made sure the power supplies are in phase with each other so the primary would not arc to each other.

I used a 7" dia secondary 23" long wound with # 24 wire.  The primaries were designed for a 4.5" secondary so I had to set the 7"secondary on top of the helix primary.  The secondary wire was about 1/2" from the primary.  I put a spacer under the secondary and lifted it up 3/4" more.

I attached the end of the secondary to the 4' long copper ground rod outside the shop and put a 10" diameter stainless steel bowl on top of the secondary for the toriod.

I turned it on and it is producing 33" arcs from the toroid.   I ran it for only a short time.  No problems so far.  

Has anyone ever tried 2 power supplies and 2 primary coils on the same secondary before?

Gary Weaver