[ARC5] Mica Capacitor

[Clare Owens]

Nobody has mentioned the Corning glass capacitors so far...  I have a bunch
of them in the garage and as I recall they are fairly low in capacitance.
But I imagine they are quite stable over time.

Clare

On Mon, Sep 19, 2016 at 2:51 PM, Richard Knoppow <1oldlens1 at ix.netcom.com>
wrote:

>     I think BBs were advertised to be similar. The ones I've dissected
> appeared to be wound with paper impregnated with something so it was
> translucent. The coated area did not quite go to the edges. The paper in
> the Micamolds was also similar.  There were plastic caps at the time, made
> by Condenser Products Company under the name Plasticon. They made a variety
> of types including some oil filled with silicon oil. This is c.1947. They
> were significantly more expensive than equivalent paper caps.  The company
> still exists so I wrote asking what kind of plastic they used for
> dielectric. No one there knew. I suspect they have been through many hands
> since the old days plus very few businesses have any sense of their history.
>     Orange Drop was a trade name used by Sprague, just as Black Beauty and
> Telecap were. I thin later Orange Drop caps may have been of a different
> construction but am not sure.  The term gets used carelessly for any radial
> lead dipped cap with an orange color but these can be plastic dielectric or
> even mica caps.
>    I think there have been changes in manufacturing methods that account
> for the economical cost of plastic plus the significant improvement in
> performance and life over paper. Its also possible there were patents
> involved but I have not searched for them.
>
> On 9/19/2016 11:18 AM, Arden Allen wrote:
>
>> Orange Drops are not paper (and some made by others are not orange).
>>>
>> But they are always a bad choice for replacing an axial lead device
>> mounted on a terminal board and usually a bad choice in point to point
>> wiring.
>>
>> Not that it’s salient, the first Sprague orange drops were paper and
>> plastic film.  Why not just plastic?  Dunno.
>>
>> Arden Allen
>> KB6NAX
>>
>
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
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