[Hallicrafters] Silver mica replacement,

[Lloyd KK7IZ]

For a good explanation of old mica caps go to
http://www.antiqueradioarchives.com/TM11-310/TM11-310.pdf
Page 14 and on
Thanx
Lloyd  KK7IZ
kk7iz at cox.net

Lloyd Godsey  KK7IZ
1315 N. Udall Circle
Mesa, Az  85203
480-620-7145 (cell)
Visit my  web site
www.lloydsdipsydumpster.com
PAYPAL welcome
And my NEW  web sites
www.antiqueradioarchives.com
www.antiqueaircraftradios.com
Collecting OLD civilian aircraft radios and literature
Particularly Lear. Got anything?
Some boatanchors got wings

----- Original Message ----- 
From: "David C. Hallam" <dhallam at rapidsys.com>
To: <caladonia at juno.com>; <hallicrafters at mailman.qth.net>
Sent: Thursday, August 17, 2006 11:39 AM
Subject: RE: [Hallicrafters] Silver mica replacement,


> If you look at the first color dot, in the upper left hand corner of the
> case, of "postage stamp" capacitors which use the old JAN standard for 
> color
> code, a black dot indicates mica, and a silver dot indicates paper.
>
> David
> KC2JD
>
> -----Original Message-----
> From: hallicrafters-bounces at mailman.qth.net
> [mailto:hallicrafters-bounces at mailman.qth.net]On Behalf Of
> caladonia at juno.com
> Sent: Thursday, August 17, 2006 2:33 PM
> To: hallicrafters at mailman.qth.net
> Subject: Re: [Hallicrafters] Silver mica replacement,
>
>
> There are also a lot of "postage stamp" type capacitors found in some
> old boatanchors that look like micas, but are actually paper in a
> molded case. The ones I have encountered were made by  "Micamold" in
> black molded cases and usually .01 mf or larger.  They almost always
> have considerable leakage and often the case is split.
>
> Les Layton
> Las Vegas, NV
>
>
>
>
> -- "" <pulsarxp at earthlink.net> wrote:
>
> I think there is a lot of confusion going on here.  Some are confusing the
> notion all micas are alike.  There are Micas and then there are silver
> micas.  The old "postage stamp" type micas were not SILVER MICAS.  They
> also had a tendency to have their two sided molded envelope crack.  Also
> moisture had a tendency to get inside and if you put them on a volt meter
> actually show they were producing a voltage as a BATTERY.  I awhile back I
> restored a Johnson Viling I transmitter.  it had around a dozen as I
> remember .01 or something similar postage stamp type micas in it. 
> everyone
> of them was leaking and producing a voltage as they were acting as a
> battery.  they must have been filled with moisture and most appeared to be
> cracked.  These were not silver micas.  I have never seen a modern "ruby"
> colored silver mica go bad.  Their dipped covering is also superior to the
> old postage stamp type micas.
> Lee
> w0vt
>
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