[Hallicrafters] Silver mica replacement,

[caladonia at juno.com]

I have saved some Micamold type 345 and 340 capacitors that were
removed, all are paper. Most have the 4th dot on top (next to the
Micamold wording) colored yellow which corresponds to a 400 volt rating
as given in the parts list. I'm not sure if Hallicrafters ever used
these, but National did and I believe they were also used in some
BC-348 receivers.

Les

 

-- "David C. Hallam" <dhallam at rapidsys.com> wrote:
I am not familiar with the type 345 Micamold capacitor.  Is it always a
paper capacitor?  I see from the picture in the link that they have 3 dots.

There were 2 - 6 dot systems, JAN and EIA and they are slightly different.
In the JAN system, the first dot is always black or silver identifying mica
or paper.  The EIA system does not use the type identifying dot.  So if a
capacitor has a black or silver first dot, use the JAN system.  If not, use
the EIA system.  I noticed the other day that the new Radio Daze
catalog has
a good explanation of the various color coding systems.

73
David
KC2JD

-----Original Message-----
From: caladonia at juno.com [mailto:caladonia at juno.com]
Sent: Friday, August 18, 2006 12:58 AM
To: dhallam at rapidsys.com
Cc: hallicrafters at mailman.qth.net
Subject: RE: [Hallicrafters] Silver mica replacement,


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




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