[Milsurplus] A part that seldom fails

[Charlie L.]

I have recently run into a part that I had never seen fail before other
than breakage and I have been fixing stuff for over 63 years, those tubular
ceramic caps where the ends are silvered, wire is wrapped around and
soldered, and the gap between the silver sections sets the capacitance.  So
far it has only been the small low value caps, 30pf or less.  Just had one
take out a plate resistor of a SX100 RF amp stage when it changed from 24pf
to 519 ohms to ground via a coil.   I know the silver micas go bad, but
these recent failures make me more aware to check this style cap now too.
Seems like the giveaway is if you see what looks like corrosion migrating
on the ceramic.  So far, the painted ones and the larger value on bigger
ceramic tubes have not shown similar failures.

Charlie, W4MEC in NC,
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