Fw: Re: [ARC5] Clarification -T22 Request for Conversion Info

Wed, 6 Mar 2002 10:03:18 -0600

Interesting question, David. I have seen several mica compression 
trimmers fail due to mechanical problems with the mica breaking or
corrosion which bridged the mica (this is what makes those air 
trimmers on ARC-5 IF cans so superior). I've seen just a few micas 
with leakage which probably came in through the lead entry/exit.
I have never see a dipped SM leakage failure.

There are of course many paper capacitors in TV-7s etc which may 
look like micas (light/dark brown rectangular bodies) but they are
really paper capacitors ....not much better than the wax sealed ones.

73s  Kees K5BCQ

--------- Forwarded message ----------
From: David Stinson <[email protected]>
To: ARC-5 <[email protected]>
Date: Wed, 06 Mar 2002 09:22:14 -0600
Subject: Re: [ARC5] Clarification -T22 Request for Conversion Info
Message-ID: <[email protected]>
References: <[email protected]> 
	<[email protected]> <[email protected]>

"J. Forster" wrote:

> I believe that caps can be reformed if the appropriate voltage is
applied
> carefully. Leakage in non-electrolytics may well be moisture related
and warming
> or applying voltage might help with that...

I'd like to see some work on this.
Does anyone know if the mica leaks moisture?
I wonder if this is why they replaced the mica with
ceramic on late and type-12 production.
73 Dave S.
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