[Boatanchors] Capacitor coding

[rbethman]

Richard,

The charts I provided are "general" as in those that used to be in a 
Heathkit construction.

I do NOT propose to follow "Military Specifications".  That is where the 
rub lies.

While the charts I provided aren't exactly wrong, neither are they 
entirely "right".

Essentially the ones I put out there are "RMA" markings.

Bob - N0DGN

On 1/8/2013 3:59 PM, Richard Knoppow wrote:
>
> ----- 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
>