RE>Re: RE>Re: Testing capac (fwd)

---------- Forwarded message ----------
Date: 30 Jul 1998 10:39:59 -0700
From: Dale Hall <Dale.Hall-at-trw-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: RE>Re: RE>Re: Testing capac

RE>Re: RE>Re: Testing capacitors ( (fwd)
Dr. Res,
The BYCAP terminal cfg is as you described except the studs are 8/32. 
Are the BYCAPs inferior or about the same as Plastic Caps' for Tesla svc ?
Date: 7/29/98 8:12 PM
To: Hall, Dale
From: List, Tesla

Date: Tue, 28 Jul 1998 23:57:27 -0600
From: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
Subject: Re: RE>Re: Testing capacitors ( (fwd)

to: Dale

For the record, most of GE's X-Ray caps are manufactured by Plastic
Capacitors, Inc., in Chicago, IL.   We carry them in stock and derate them
for Tesla coil service to 50 kV.  Value is .01 MFD with 1/4 inch stud
terminals -- lower one exits side of case and upper terminal exits directly
on top of brown phenolic case.  They work great with NST coils and also
synchro RSG's.


> Date: 28 Jul 1998 12:53:04 -0700
> From: Dale Hall <Dale.Hall-at-trw-dot-com>
> RE>Re: Testing capacitors (fwd)
> Terry P,
> What are your Xray cap specs/mfr ?  
> I have 4ea .01 80kV BYCAP, Inc which are Polypropylene/Al foil tab to screw
> vacuum oil filled.  The only deficiency may be the connections to the screws
> - could be beefier for high discharge currents (for which they weren't designed)
> but should work OK. I spoke to the owner about a year ago - Ken Yihiro
> at 800 322-9227.  The Caps were custom for a GE Xray V-multipy applic.
> Mine are housed in brown phenolic, 6A803-103CA, mfrd 8/90 in Chicago,ILL.
> Dale
> ------------------------------
> Date: 7/27/98 8:38 PM
> To: Hall, Dale
> From: Terry Perdue <terryp-at-halcyon-dot-com>
> (I posted this recently, but received no replies, except one asking me not
> to post in HTML, which may have made it unreadable to some. Now that I've
> figured out how to turn that off, I'll ask my dumb questions again):
> 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
> 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