need help tuning my coil:

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Pat Masterson <bat-at-grumman-dot-com> 

  I need some suggestions on the poor performance of my first coil in
20 years. The best I'm getting is 5 inch weak streamers, but only when
tapped at turn 2 of my primary. Here are the coil's components:
-primary is quarter inch refrigerator tubing space a quarter inch. I have
about 10 turns on the board.
-cap is 5 geek 150 NFs in series, making 30 NF.
-HV is a 7500v/60 ma NST. (have RF chokes on both sides)
-single static gap with a 4 inch fan blowing hard on it. A larger gap 
(around .06 in)
seems to give best performance.
-secondary is a 2.375 PVC with 1300 turns of 28 ga wire, about 18 inches of 
wire.
-Topload is a Freau 6 inch aluminum toroid.

  I have adjusted the caps from 25 NF up to 33 NF and didnt see much 
difference.
When I move my tap out from turn 2 I lose the streamers. Any ideas whats 
wrong with my
setup?

Thanks.  -pat