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Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!uunet!isis!whester
From: whester@isis.cs.du.edu (William R. Hester)
Newsgroups: sci.electronics,rec.radio.amateur.misc
Subject: Re: Looking for High Voltage Capacitors
Message-ID: <1991Mar23.172511.21814@isis.cs.du.edu>
Date: 23 Mar 91 17:25:11 GMT
References: <1991Mar18.194939.1257@leland.Stanford.EDU>
Reply-To: whester@isis.UUCP (William R. Hester)
Organization: Math/CS, University of Denver
Lines: 37

In article <1991Mar18.194939.1257@leland.Stanford.EDU> stankus@leland.Stanford.EDU (John Stankus) writes:
>
>I am desparate need of some high voltage capacitors (4-6KV) 5pF.
>Since the demise of the vacuum tube nobody seems to make these anymore.
>Does anyone know of a source for these and other HI-Voltage Capacitors.
>
>
>Thanks
>
>John J. Stankus  N5PEE			Dept. of Chemistry
>stankus@leland.stanford.edu             Stanford University

John, if checking the local ham swapfests and swap lists fails, then consider
making them yourself.

Look up the formula for capacitors in the ARRL handbook.  You can use
small sections of sheet copper, single sided printed circuit board, or
even lids from tin cans for the plates.  Use window glass to insulate
the plates...with the glass extending out from the plates to assure the
6Kv won't arc around the plates.  You'll find the dielectric constant for
glass to be very good and normal thickness of window glass should give
adequate Kv ratings.  

Another source for factory make caps in this range can be old television
receivers...

Try stacking six 1.5 KV rated disc ceramic caps in series with good
spacing between them.  Let's see, six 30pf in series should give about
5 pf that you asked for...

Best Luck

-- 
Bill Hester, Ham Radio N0LAJ, Denver CO., USA | N0LAJ @ W0LJF.CO.USA.NA
Please route replies to: whester@nyx.cs.du.edu or uunet!nyx!whester   
Public Access Unix @ University of Denver, Denver Colorado USA
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