Speedy wrote:
I love Chinese capacitors designed and manufactured to screw us over.
It's actually funnier than that; Wikipedia only admits to half of the story:
http://en.wikipedia.org/wiki/Capacitor_plague
(Apple was bitten badly by this; there were a lot of Airports and iMacs affected.)
The full story is that the "Bad Formulation" was deliberately left where it could be easily found. What started out as a simple "Industrial Espionage" revenge prank then went wildly out of control.
The result is that for serious purposes, no Chinese capacitor can be trusted at all. There are definitely good ones, but how can one tell?
Sometimes, actual legitimate manufacturer incompetence is involved. Hitachi will never live down that awful "SV" line of series bias diodes. Delco, if they were still around, has some 'splaining to do about those tawdry XPL909 transistors. And RCA's Dual-Gate 40673 MOSFETS went bad just
thinking about static electricity.
But no deliberate fraud was involved.
It's almost at the point that large value caps should be socketed. If something starts getting goofy, pull the caps, go down to the local Safeway with a Capacitor checking machine, and run them through the Green-Good, Red-Bad cycle. Buy any replacements then and there, and once home, plug the caps back in, making sure that the orientations are reasonably correct.
If this sounds absurd, there were a few decades where people did exactly this, with their TV set Vacuum Tubes.
Eustace