[Boatanchors] Solar brand mica capacitors 5 dot color code.

[McDonald, J Douglas]

The dipped micas are not prone to the silver mica disease, which is dependant 
on sulfur from the air. The dipping does prevent it. If you use ceramic,
in most RF cases you need stability, i.e. C0G, which usually these days means 
surface mount parts 

As an aside, I also collect rocks. You can make incredible things of silver wires 
by heating a lump of silver in a sulfur atmosphere. Wires up to a foot long
can grow up!  These are sold as fakes for ones from the earth selling for 
$100,000! Google Freiberg Wire Silver.

Doug McDonald

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net <boatanchors-bounces at mailman.qth.net> On Behalf Of Rob Atkinson
Sent: Saturday, October 27, 2018 11:25 PM
To: Brian Goldsmith <brian at flex-tel.com.au>
Cc: Boat Anchors List <Boatanchors at mailman.qth.net>
Subject: Re: [Boatanchors] Solar brand mica capacitors 5 dot color code.

This isn't going to be much help I'm afraid, but no one else as
answered so maybe this is better than nothing.  There are around 4 or
5 different sets of dot codes but the whole thing is so byzantine,
that I just replace any of those old postage stamp micas, because it
seems like half the time they leak.   If you have a schematic or parts
list for whatever you're working on, I'd replace them with ceramic
caps for RF or polypropylene film caps if audio.  Of course you can go
with new dipped micas, but then you get into the silver migration
problem again.

73

Rob
K5UJ
On Sat, Oct 27, 2018 at 6:34 PM Brian Goldsmith <brian at flex-tel.com.au> wrote:
>
> Greetings to all.
> Can anyone help with a color code chart for a Solar mica cap with 5 dots?
> Brian g
>
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