Re: need help tuning my coil:

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

Original poster: "John Richardson" <jprich-at-up-dot-net> 

Hi Pat,

I see two things that could use some improving.  First off, lose the single
static gap in favor of a multiple copper pipe unit.  One inch pipe couplings
are cheap, and use four or five with a total gap spacing of about .2 or so.
Also, your toroid could be quite a bit bigger.  My personal opinion is that
the small six inch is way too small for a 7.5/30.  Get some 3" drier duct,
and go for about 16" OD.  This should also allow you to tap further out,
which would be benificial.

John Richardson
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, April 19, 2004 12:22 AM
Subject: need help tuning my coil:


 > 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
 >
 >
 >
 >