[Heath] Strange Issue With HW-20

[Robert Gibbons]

I've seen some old disc ceramics that appear to have been dipped in wax,
possibly to waterproof them. Over time it appears that just the normal heat
generated in the chassis is enough to make the wax run.

On Fri, Mar 16, 2018, 12:26 PM Doug & Kathy Davies <dkdavies3 at gmail.com>
wrote:

> I recently completed an electrolytic cap replacement project on an HW-20
> Pawnee 2M AM rig.  When I took the bottom plate off the chassis, I noticed
> that nearly all of the big 0.02mfd disc ceramic bypass caps appeared to
> have had their outer coverings melted.  There were actual drops of stuff
> hanging off the bottoms of the caps.  I don't see why this would be
> happening since there's nothing underneath the chassis that would cause so
> much heat.  Previously, I did a restoration on an HW-10 Shawnee which has
> essentially the same circuitry and it didn't have this condition.
>
> Any ideas as to why this would happen?  It has me a bit worried.
>
> Doug
> VE7DRF
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-- 

Robert Gibbons
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