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New Coil
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From: David Dean [SMTP:deano-at-corridor-dot-net]
Sent: Thursday, June 25, 1998 8:24 PM
To: Tesla List
Subject: New Coil
Just acquired a distribution transformer
nameplate specs KVA 5 , %IMP -at- 85deg C 1.6
high voltage 7200/12470 , 14400/24940
low voltage 120/240 , non PCB
switch set at 14400
About two months ago found a piece of spun fiberglass pipe 6" nom.
Actual O.D. 6 5/8"
wall thickness 3/16" overall length 54". This is glass/epoxy.
Now I've got the itch.
Have been following the thread about conventional coils being magnifiers
with some interest.
This idea was presented to me by a Mr. Mull about 12 years ago, just
before he died, along with some
other interesting ideas, things he had tried when he was an avid coiler
back in the '30s.
About 3 1/2 years ago I made a small coil with two windings on one
coilform, first winding
about five inches long, then very widely spaced turns for about twenty
inches, then another winding about
fifteen inches long. This was on a 1 1/2" OD acrylic tube with #40 wire.
Primary was about twenty turns of
#12 wire on a cardboard tube 3 1/2" Dia. Power source was a copier power
supply 5.5KV DC -at- 0.6mA.
Cap was internal to power supply, when the supply died, I dissected it
and found the cap to be rated
12KV DC .050 uF mylar dielectric. Spark gap was two bent copper wires.
It made 1 1/2 inch sparks
with or without any topload. Very disappointing.
>From what I have learned during the last ten months reading on this
list, I can see why it did not work well.
Everything was wrong. However, once bitten, twice shy. I am now inspired
to think that it might work,
but I don't want to waste a coilform that I am unlikely to happen across
again.
So, should I stick to the tried and true? Or should I go for broke...
Any suggestions will be appreciated.
Thanks,
deano