[R-390] mechanical filter solvent

[Craig C. Heaton]

Charles,

Haven't found the magic juice, yet! I can tell you that rubbing alcohol,
acetone (finger nail polish remover), gasoline, MEK (methal ethel ketone
sp?), paint thinner, did not touch the potting stuff (black in color) on the
bobbin/filter I've played with. Didn't faze the bobbin either!

I have the feeling this potting fluid is really the same material as the
bobbin. Food for thought; if the bobbin and potting stuff is delrin, the
stuff that is used for the gears in the HP 8640B sig-gen, it shrinks with
age. So the bobbin & potting fluid shrink, crushing and breaking the #42
wire wound on it.

Craig,




-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Charles A Taylor
Sent: Thursday, November 08, 2007 5:19 PM
To: r-390 at mailman.qth.net
Subject: [R-390] mechanical filter solvent

Has anyone discovered the magic juice that dissolves
the potting fluid on the bobbins?

Charles


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