[Milsurplus] [Boatanchors] OLD mica condensers

[Michael Tauson]

On Thu, Jun 25, 2009 at 3:47 PM, Carl<km1h at jeremy.mv.com> wrote:
> And dont forget that Micamold, NOMA and others put paper foil caps in square
> and lozenge shaped enclosures that look just like mica caps.

I know all too well.  It took a while to be able to differentiate
between them, some of that time being spent letting the smoke out.  As
I understand it, this is generally not considered a good thing.

One thing I did when I was still making the breadboard receivers was
to roll my own paper caps using either Kraft paper or waxed paper,
dependent on which I had on hand.  I never pushed them past 90v since
the receivers used that as the B+ so really have no idea how far I can
push them before they fail.  (That would probably be an interesting
experiment some day.)  Another thing I made was sliding plate variable
caps that also weren't pushed past 90 volts so, again, I don't know
what they could handle.

My test equipment is minimal at best which puts some limits on what I
can and can't do but I seem to recall methods of testing leakage using
pretty much what I have on hand so it may not be all bad after all.

BEst regards,

Michael, WH7HG
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