[Milsurplus] Mica capacitor identify.. more

[Lloyd KK7IZ]

You will find all kinds of info at
http://www.antiqueradioarchives.com/TM11-310/TM11-310.pdf
"bout half way thru.
Thanx
Lloyd  KK7IZ
kk7iz at cox.net


----- Original Message ----- 
From: "J Forster" <jfor at quik.com>
To: "Glenn Little WB4UIV" <glennmaillist at bellsouth.net>
Cc: <Milsurplus at mailman.qth.net>
Sent: Saturday, May 26, 2007 2:09 PM
Subject: Re: [Milsurplus] Mica capacitor identify.. more


> Google finds:
>
> Date:                           Mon, 26 Feb 2001 21:59:32 -0500
>   Reply-To:                           "Kenneth D. Grimm, K4XL" <[log in to
> unmask]>
>   Sender:                           Boat Anchor Owners and Collectors List 
> <[log
> in to unmask]>
>   From:                           "Kenneth D. Grimm, K4XL" <[log in to 
> unmask]>
>   Organization:                          BoatAnchor Manual Archive
>   Subject:                           Re: How to read postage-stamp micas 
> (not
> the color dots)
>   Comments:                           To: Mike Silva <[log in to unmask]>
>
>
>  Mike Silva wrote:
>
>  > I've got some postage-stamp micas that have their values indicated via 
> text >
> rather than color dots, and I don't know the
>  code (except I can figure out > the mmf's). Some examples: > > CM35E 103 
> JN3
> (0.01 uf) > CM30F 242 JP3 (2400 mmf)
>  > CM35F 103 GP3 (0.01 uf) > > It's the CM stuff and the JN/JP/GP stuff I 
> don't
> know. Checked some ARRL >
>  handbooks from 1950 to 1980 and didn't see anything. Mostly I care about 
>  > the
> voltage ratings. Thanks!
>
>  These three caps are marked according to Mil-C-5C standard of the 
> 50s-60s. The
> CM indicates "capacitor, mica." The 35
>  simply designated that it was mounted using leads. I believe that the 
> next
> number was the voltage rating with E being 600volts
>  and F being 1000volts. Then the capacitance, followed by the J for 
> capacitance
> tolerance of 5% or G for 2% or K for 10%
>  or F for 1%. The next letter designated the operating temperature range 
> with
> M=-55C to +70C, N=-55C to +85C,
>  O=-55C to+125C and P=-55C to +150C. The final number was either a 1 or a 
> 3
> indicating a "vibration grade" of either 10
>  to 55cps or 10 to 2,000cps. CC caps were ceramic and CN were molded paper
> dielectric caps. The numbering systems
>  were similar. My memory is a bit fuzzy on some of the mil numbering 
> systems,
> but this is close if not exact. Hope this is of
>  interest. Perhaps it will inspire someone to check what I have remembered 
> and
> fill in the gaps.
>
>  Ken K4XL [log in to unmask] *** BoatAnchor Manual Archive *** On the web 
> at
> http://bama.sbc.edu or FTP site info:
>  bama.sbc.edu login: anonymous p/w: youremailadr
>
> -John
>
>
>
>
> Glenn Little WB4UIV wrote:
>
>> Rick
>>
>> The Mil Spec that covered this capacitor was MIL-C-5/10. This has been
>> canceled. The basic MIL Spec is available here:
>> <http://www.dscc.dla.mil/Programs/MilSpec/ListDocs.asp?BasicDoc=MIL-C-5> 
>> .
>>
>> My take on this is that this is a 0.039 MFD capacitor, +/- 5%, 
>> temperature
>> rating of -55 to +85 degrees C, The voltage does not decode and is 
>> probably
>> 100 VDC, it appears to have a temperature coefficient of -20/+100 ppm /
>> degree C +/- (0.1%+ 0.1 pF).
>>
>> Hope that this helps some.
>>
>> 73
>> Glenn
>> WB4UIV
>>
>> At 01:21 PM 05/26/07, Rick Brashear wrote:
>> >I just discovered a couple of Cornell Dubilier mica capacitors in the 
>> >bottom
>> >of a drawer, however, they are unmarked in the normal sense.  I can 
>> >measure
>> >them, but I need to know what they are supposed to be before that makes 
>> >any
>> >sense.  Each have the following printed at the bottom of the case:
>> >CM6OE393JN1.  Does that mean anything to anyone?  Is that a 39000 pf? 
>> >How
>> >about voltage and amperage rating, they are Type 9 mica caps?
>> >
>> >Thanks,
>> >Rick
>> >
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