Re: Testing caps (fwd)

---------- Forwarded message ----------
Date: Mon, 27 Jul 1998 21:53:42 -0600
From: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: Testing caps (fwd)

TO: Terry

Build a leakage tester that runs on HV (approx 5-10 kV) and check them for
leakage current.  If good, then they will work fine.  See a future issue of
TCBA for an article on this very item.


From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com
Subject: Testing caps (fwd)
Date: Sunday, July 26, 1998 8:31 PM

---------- Forwarded message ----------
Date: Sun, 26 Jul 1998 11:11:14 -0700
From: Terry Perdue <terryp-at-halcyon-dot-com>
To: tesla-at-pupman-dot-com
Subject: Testing caps

I posted a message a few weeks ago about some oil-filled 10nF 80kvdc "xray
machine" caps I have, asking if they might be suitable for TC use. Several
people thought it was worth a try, but suggested a safety enclosure, in
case they overheated and exploded. My question is this: 

Is there a way I can test them for suitability before building the whole
system? I have a NST, and could fashion a temporary spark gap. I'd like to
run a minimal system long enough to give me confidence that these caps
will survive before going any further, as I'm not interested in rolling my
own cap. 

Two other questions: 

I had hoped to use 10" diam acrylic tubing for the secondary, but at
$40/ft, may have to use PVC. But I'm considering getting some sheet
acrylic and melting it around a form, possibly in half-cylinder sections,
then cementing them together. I've been pretty successful forming
plexiglas in this way in the past, and assume that it is the material of
choice. Has anyone tried this? (I'm assuming that the sheet stock is much
less expensive.) 

Finally, I think I read that if the spark gap is close enough to the
transformer, secondary RF suppression isn't necessary. Is there agreement
on this? 

Thanks for your comments.

Terry Perdue