RE: Big Time Coil Problems...

• To: tesla-at-pupman-dot-com
• Subject: RE: Big Time Coil Problems...
• From: "Dale Hall" <Dale.Hall-at-trw-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Fri, 18 Feb 2000 16:32:33 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Additionally: Mica's do not self heal !

one internal arc and its a Mica Pet Rock.

Regards, Dale

-----Original Message-----
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, February 17, 2000 4:24 PM
To: tesla-at-pupman-dot-com
Subject: Re: Big Time Coil Problems...
Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> 

Hi Paul,

> Original Poster: pmathus-at-learningco-dot-com 
> 
>      I could be wrong about this, but isn't mica lossy at RF frequencies, 
>      and a poor choice for MMC use?  Terry can probably confirm or deny 
>      this.  I think poly caps are what you want to be using. . . . 

Mica caps are a poor choice for MMCs but only because they are 
so horrendously expensive. RF-wise, they are an excellent choice. 
What do all those old radios have in them??  I was lucky enough to 
be given a box full of transmitting micas and two of them are still 
going strong in a small coil I sold a year ago despite being thrashed 
at their rated voltages.
        All my MMCs use polypropylene-foil caps.

Regards, Malcolm

snip...
       

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