Re: ebay caps

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com> 

I've always had bad luck with mylar mmc's (before I discovered 942c's),
never tried bigger versions. Might have been a different failure mode other
than dielectric heating.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, February 19, 2004 10:01 AM
Subject: Re: ebay caps


 > Original poster: "Harold Weiss" <hweiss-at-new.rr-dot-com>
 >
 > Peter's right!
 >
 > I run the Fair Radio caps with my 6" coil.  They do heat up, but it does
 > take some time.  On the 4th of July, I was running about 1-2 minute runs,
 > with about 5 minute cooling periods for about an hour, before letting them
 > cool for 30 minutes.  The caps were warm but not "pull your hand away"
hot.
 > Just give them time to disapate the heat between runs, and they will work
 > ok.  During this time I was more worried about the resistor tempature in
the
 > filter than the caps.
 >
 > David E Weiss
 >
 >  > Original poster: "Peter Terren" <pterren1-at-iinet-dot-net.au>
 >  >
 >  > I wouldn't be too critical of Mylar caps as I know of one set that have
 >  > lasted 20 years in a 3kW museum coil. They are still lasting although I
 > have
 >  > supplementied them with some Geek group caps since.
 >  > http://members.iinet-dot-net.au/~pterren/Scitech.htm#Original%20coil
 >  > Cheers
 >  > Peter (Tesla Downunder)
 >  >
 >  >
 >  >  > Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
 >  >  >
 >  >  > It says film, so if it's polyester/mylar it will probably heat up on
 > even
 >  >  > 100-200 watt coils, pushing your luck with higher power.
 >  > snip
 >  >
 >  >
 >  >
 >
 >