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RE: coilform size and AWG wire wize

Original poster: "Philip Chalk" <philip@xxxxxxxxxxxxxxxxx>

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Monday, 1 May 2006 18:54 pm
To: tesla@xxxxxxxxxx
Subject: Re: coilform size and AWG wire wize

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

As mentioned my sec is 4.5" x 21.8085"

[ It's that last half a thou that makes all the difference !  :-) ] -

wound with 24 awg. It's 895
turns (had to remove 5 turns due to a pin point breakout right at the
top a few weeks ago when testing other primary configurations). My
topload is 6.25" x 21". It's operating excellent right now using a
static gap (1.25" x 3" copper tubing with .05" spacing between 6
tubes, 0.25" total). It's a  vacuum gap. I've found the copper tubing
to be superior to the solid brass which contradicts my statements in
this area previously. The guys talking about thermal superiority
using the copper tubes were correct. So out with the brass. Sure
looked nice though.

Coupling is 0.129. The bottom sec winding and flat primary are even
on the same plane. Free-air spark lengths are around 54" and my son
mentioned a couple days ago that it's the smoothest running coil he's
seen me build. This coil is also wound on a black pvc tube. Cap size
is configured for 0.0188 uF and the inner primary is 1.48" from
secondary (1/4" tubing, 1/4" spacing edge to edge tapped at 8.4 turns.

Take care,

Tesla list wrote:

>Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>On the 4 inch ID PVC coils we run #28 AWG 150 degree C. wire with
>good success.  I've also run 30 AWG but this is only necessary if
>running a 9 kV 30 mA xmfr as opposed to a 12 kV 30 mA xmfr.  With 60
>mA available current I usually run a 6 inch ID PVC coilform for good
>John Freau's toroids work great on most all 30 mA coils.  I usually
>run a 20 x 5 when going up to 60 mA and 6 inch dia. coilform.
>Dr. Resonance
>>In a message dated 5/1/06 12:33:15 PM Eastern Daylight Time,
>>tesla@xxxxxxxxxx writes:
>>>example, my little 4.5" coil is only 895 turns with 24 awg. D.C.
>>>would likely add two or three hundred more turns and use a smaller
>>>gauge wire. This may be a phenomenon for high L coils. I guess only
>>>D.C. could say if he's done the same testing with lower turn coils.