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Re: .062uf 20,000 volts cap on Ebay
> Date: Mon, 13 Mar 2000 16:25:59 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: .062uf 20,000 volts cap on Ebay
> From: Tesla List <tesla-at-pupman-dot-com>
> Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz>
>
> Hi all,
> I had to jump in on this one:
<snip>
Malcolm, et. al.,
I had to jump in on this one as well. Sangamo mica caps (sometimes)
if you are lucky, do hold up to repeated abuse at (or above)
nameplate ratings. I must take exception that mica caps (in general)
are lossy. Quite to the contrary! They are very low loss: (look
up the dielectric loss tangent of ruby mica in any CGC Handbook.)
Mica caps are possibly the very best, at being low loss and high
effeciency; espececially with respect to size and weight, not
to mention low dielectric heating cooeficients, even at many MHz
of operating frequencies. They are, however, *much less forgiving*
then extended foil type capacitors; especially the poly-pro family.
In my more then 25 years of work with this type of capacitor I
submit the following (rated best to worst.)
#1) Cornell-Dublier
#2) Aerovox (now mfr. under a different name.)
#3) Sangamo
#4) (the absolute worst) Solar
I've spent many $$$ finding out these facts over the years. The
Solar brand will (typically) fail where the p-to-p voltages are not
even up to the nameplate rating. FWIW!
Best regards,
Bill Wysock.
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Tesla Technology Research