RE: Big Time Coil Problems...
Additionally: Mica's do not self heal !
one internal arc and its a Mica Pet Rock.
From: Tesla List [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, February 17, 2000 4:24 PM
Subject: Re: Big Time Coil Problems...
Original Poster: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz>
> 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.