[Milsurplus] replacement question -

[J. Forster]

Fairly modern micas (CM04, CM05, CM06, CM07) come in values up to at least
8200 pF, and I think 10,000 pF, which is 0.01 uF. They are not cheap.

-John

=================


> Richard,
>
> Could be the infamous Micamold paper caps or similar product from
> another manufacturer.  Keep in mind that a .008 uF mica could be pretty
> big.  If in doubt, hit one with a hammer, and see what's inside.
>
> Al
>
> On 8/10/2013 4:16 PM, Richard Brunner wrote:
>> I once resurrected an RBL receiver, and a dozen mica capacitors and
>> only one oil-paper capacitor failed. I just checked the instruction
>> book, and it says "Capacitor, Molded Mica."  Some are suspiciously
>> large for mica, 1000 to 8000 mmfd, so they could have been paper.
>> Maybe quality control was lax during WWII, but I have been suspicious
>> of micas ever since.
>>
>> Richard, AA1P
>>
>>>> capacitor replacement .
>>>>
>>>> "Normally" the Silver Micas never need replacement but if they have
>>>> to be replaced could that be effectively replaced with a modern
>>>> ceramic with the appropriate
>>>> tolerance and temperature characteristics.  which leads me to this
>>>> question:  In WW2 what were the typical characteristics of a Silver
>>>> Mica capacitor?
>>>>
>>>> Just shoot me for asking.
>>>> Hutch
>>>>
>>
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>
> --
> Al Klase - N3FRQ
> Jersey City, NJ
> http://www.skywaves.ar88.net/
>
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