[Hallicrafters] Silver mica replacement,

[caladonia at juno.com]

The Micamold type 345 paper capacitor that I was refering to does not
seem to conform to the JAN standard for color coding, but is not hard
to figure out. For a good picture see the following link:

http://antiqueradio.org/recap.htm#types.

I recently restored a National RBL-5 that used numerous paper
capacitors of this type. Every one was bad.

Les

 


-- "David C. Hallam" <dhallam at rapidsys.com> wrote:
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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