On 13 Nov 2017 21:38:26 GMT, Jim Mueller wrote:

On Mon, 13 Nov 2017 00:21:56 -0600, oldschool wrote:

big snip

That's deceiving. It's called a MICAmold. That would tell me that it's a
MICA cap.

another big snip

Micamold is the name of the manufacturer as several others have already
said. They made mica capacitors that were as good as anyone else's, but
they also made paper capacitors in a similar style case which are as bad
as anyone else's. Then again, they also made resistors in an elongated
version of the same case with three color dots. These need to be tested
along with all the other vintage resistors in a set. They may have made
other parts as well that I am not aware of (yet).

Getting paper caps into that shape must have been a trick. They are not
just rolled like the tubular ones. Considering the time they were made,
I am wondering what the material is for that case (coating). I'm
thinking bakelite, which was one of the first plastics and a lot of
other electrical stuff was made from bakelite in that time period, like
light fixtures, wall switches, and more. It seemed to be a good product
though. A lot of the old fixtures and stuff is still in use.

Other manufacturers also made paper capacitors in domino style packages;
there is a color code option identifying them.

LIke I said, I have a .jpg image I found on the web showing the dot
patterns for different manufacturers. Each had variations. I think there
are five types. I'd post the URL if I knew it, but I just saved the
image awhile ago.

Some mica capacitors had the value stamped on them either with ink or
pressed into the plastic. If the ink on a capacitor faded or rubbed off,
then it would be unmarked. That's where a schematic is useful.

This one has no color on the dots but has [ CA-281 ] stamped on it. I
cant see how that number means anything. It's supposed to be .01 @ 600V.
How CA 281 can mean anything about .01uf or 600v is beyond me. (Maybe
just a manufacturers code of some sort).