[Boatanchors] Capacitor coding

[Richard Knoppow]

----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: "Boatanchors @ Mailman" <Boatanchors at mailman.qth.net>
Sent: Tuesday, January 08, 2013 12:31 PM
Subject: [Boatanchors] Capacitor coding


> These were put out on another list last year.
>
> They are excel spreadsheets, new and old.
>
> They are on my site to download:
>
> <http://home.comcast.net/~rbethman/Color Charts.xls>
> <http://home.comcast.net/~rbethman/Color Charts.xlsx>
>
> Bob - N0DGN
> ______________________________________________________________


   But, see the charts in military handbooks of the period. 
In TM 11-880 (RCA AR-88A and F) the code for postage stamp 
molded paper caps indicates _all_ have a silver dot in the 
upper left hand corner of the six dots and in the middle of 
the bottom row. This is C.1945  A later handbook, TM 
11-896A, c.1952, shows the molded paper type having only a 
single silver dot, that in the upper left hand corner.  At 
this point a silver dot indicates paper, a black dot 
indicates mica. This same code is shown in TM 
11-5820-385-35, the depot manual for the R-390A dated 
December 1961.  Silver also means 10% tolerance. Its 
possible that at the time TM-11-880 was printed all of these 
caps were 10% but I don't think so.  At any rate a silver 
dot at the top left seems a pretty sure indicator of a paper 
rather than mica cap, at least by the JAN system.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com