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Problem with the coil.



Hi!
I have made all parts of my tesla coil but I can't make it to work.
(Im goaing to make a DC powered unit).
Here is the description of all parts:

1. The transformer is 150mA 13000V current limited.
2.I have a 20kV rectifier made from four diodes.
3.I have 90nF and 100nF capacitors so I can have 47,90,100,or 190nF tank
capacitance.(Both capacitors are rolled type polythene,oil filled. The
values are measured with a meter).
4.Spark gap is single air blown gap.
5.Primary is a flat spiral 12 turns.
6.Secondary is 100mm diameter , made from 0.7mm diameter wire on a PCV
pipe. It is 770 turns.
7.Toroid is 17pF
8.Grounding is cold water pipe (it's a metal pipe goaing straight to
ground.)

I don't know why my coil is not working properly. Perhaps it's not tuned
properly. I tuned my coil by changing the tap point on the primary ,
and watching the spark lenght to the grounded rod.Unfortinately the 
longest spark was only 20cm long. Also there were no sparksto the air.
I have got the 20cm spark when primary was 2,4 turns (close to 2,6
counted by WinTesla).

What parts schould I change or what schould I do to make my coil
working. 

Thanks for all answers.

Kamil Kompa.


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