[TCML] Please help with my non-working tesla coil.

[cho yan ping <cho_yan_ping@xxxxxxxxxxx>]

Dear coilers,

I built a tesla coil two months ago. However, I never obtained any open air discharge at all.
I am quite dissapointing and hoping for advice from anybody.

Here is my specification of my  tesla coil:
Power supply: NST 7.5kV 30mA 50Hz
Cap bank: Polypropylene Cap 15000VDC 22nF
Spark gap: Multistatic spark gap 4mm
Primary coil: Copper tube 3/8" tapped at 4-6microHenries
Secondary coil: Diameter 3.25" Height 18" Inductance 7.8miliHenries
Top:Ducting pipe toroid
Grounding: NST ground and RF are connected to main or to a 15sq. foot iron fence.
Protesction: two 5 microHenries choke coil, no safety gap.

And the circuit is connected as
http://www.pupman.com/howto/TANK2.GIF

The spark gap is firing nicely, there are little sparks between secondary coil and primary sometimes.
However, the top toroid don't seems to give arc even with a breakout point.

I am thinking if I replace the cap with bottle cap would produce better result?
Or any other modification would make the coil work?
Please give any advice, thank you!

Regards,
Chester



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