Re: polyester cap?

• To: tesla-at-pupman-dot-com
• Subject: Re: polyester cap?
• From: "teslacoilfreak1" <teslacoilfreak1-at-mediaone-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 12 May 2000 12:13:29 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

----- Original Message -----
From: "Tesla List" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, May 11, 2000 6:50 PM
Subject: polyester cap?


> Original Poster: "Trent Mullins" <neontrent-at-earthlink-dot-net>
>
> Hello evereybody,
>
> Would metalized polyester caps be any good for an MMC?
> They're Mallory brand rated at 2.2uf -at- 250vdc.
>
> Thanks,
> Trent Mullins
> <mailto:neontrent-at-earthlink-dot-net>neontrent-at-earthlink-dot-net
> (bendin' glass & passin' gas for a livin')
>
>

Hello Trent,

polyester caps are no good for MMC use,polyester has high RF losses(heat) at
TC freqs. Heating of the cap changes the capacitance causing the coil to go
out-of-tune
and also steals power from your arcs(polypropylene is the way to go)and with
your caps you would need *alot* of caps in series to get the required
voltage.
Now if you already have the caps (at least 100) you could try them by
detuning to compensate for the capacitance change,but the caps will burn up
in short order!!

hope this helps,
kevin dalpe

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