Re:70kv system questions

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

Original poster: "ebyng by way of Terry Fritz <twftesla-at-uswest-dot-net>" <ebyng-at-netlimit-dot-com>

Well, are you running any type of a top (toroid)??

That might help a little from what I know.

other than that..
That 12ga primary??

Is it an insulated wire??
how bout the secondary?? Enamel or dipped style??

:-)
Erik
----------------------------------------------
Original Message
From: "Tesla list"<tesla-at-pupman-dot-com>
Subject: 70kv system questions
Date: Tue, 03 Apr 2001 21:11:52 -0600

>Original poster: "Jonathan Peakall by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <jpeakall-at-mcn-dot-org>
>
>Howdy All,
>
>I am building a small coil, a 70kv system from John Couture's book. I am
>having some trouble getting it to break out, and am hoping for some
>advice.
>
>System:
>
>150 watt 120/12vdc power supply
>Ignition coil wrested from a '62 Falcon
>Potter and Brumfield 12v relay, # K10P-11D15-12
>470vac, .068uf and 50v 1000uf caps
>Bolt and acorn nut style spark gap, mounted on plastic cutting board
>material
>12 turns #12awg auto wire wrapped on a 3" x 5" form (Book calls for 5
>1/4")
>Aprox. 468 turns of 24 gauge insulated magnet wire on a 13 1/4" x 3 1/4"
>form (Book calls for 3")
>4 x 7.5kv .001 uf caps hooked together with two in parallel and two in
>series to theoretically produce .0025 uf.
>
>I was having trouble finding the correct size forms (I live in a town of
>368, so the hardware scene is a little limited) so I went ahead and
>coiled as listed above. As well, I coiled the secondary out of what I
>thought was 24 gauge (I had the wire I laying around from a radio
>project), but then when I measured an inches worth, it became apparent
>that I would need a longer form that the book called for, so I figured
>it must actually be 22 gauge. As it would take days for me to get more
>wire  I went ahead and wrapped it anyway. Today I got some definite 24
>gauge, and it measures out the same as what I have already wrapped. Hmm.
>I don't have a capacitance meter (ordered one, not here yet) so I can't
>verify the hillbilly primary capacitor system.
>
>I have tried a number of discharge sphere configurations, from a 1"
>brass door knob,  2" and 2 1/2" aluminum foil covered balls and a copper
>toilet float. I have tried insulators from 1/2" to 3". I have also tuned
>the spark gap and primary coil. I have raised and lowered the secondary
>relative to the primary, and spaced the primary wires a little, which
>seemed to help. Regardless of what I do, all I can get is a little
>corona from the bare end of the secondary coil wire, or 1" to 2"
>streamers to a metal object.
>
>My primary suspects: 
>
>Are the coil dimensions too out of whack to work?
>Is the 22/24 gauge thing a big deal?
>Spark gap is a little erratic. Is this a huge factor? (Making a new one
>already)
>Any way to test the ignition coil with a VOM? It *was* still running the
>Falcon...
>Primary caps are obviously suspect. Do my numbers add up in the first
>place?
>Relay sounds a little different after some use. Have been doing fairly
>short runs, but it has gotten a little hot once or twice.
>
>Anyway, thanks for any and all help.
>
>Jonathan Peakall
>
>
>
>

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