"N_Cook" wrote in message
...
Why would a SMPS high speed Unitrode rectifier stud diode 1N5812 , 20 amp,
fail sitting around in a normal human occupation heated environment for 10
years unused?
Currently reads a stable 6.2 ohms. Replaced with a new one but I intend
passing ever increasing current through the old one to see what happens.
Any other ideas concerning cause or analysis ?


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/



I suspect tarnish of interior metals, especially if they contain any silver.
I see this sort of thing in Euro capacitors and metal connectors,
fuseholders, and the like. I also have to scrape it off the leads of old
semi's that have been in a parts drawer for years.

Mark Z.