I've seen these caps. They look like a typical surface mount ceramic cap, installed
inside a glass housing with wire leads. They almost look like glass-cased small signal
diodes at first glance, until you look more closely and see the small multilayer capacitor
inside the glass housing.
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Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/