Scarred cap

[scorpio333]

Any idea what causes this? It's a cap on a power supply board. While it looks like it could make contact with the aluminum fin, it's just an illusion. There's no way it could have bent over that far.

[Sir Thrift-a-Lot]

I don't know what caused it, but I know I would replace it.   My WAG is a manufacturing defect that didn't reveal itself until power or enough heat caused it to act up.

[scorpio333]

The JD9 that cap is in has an audible hiss in it. Tried multiple different remedies - tubes, OP amps, rerouting wires, etc and so far nothing has tamed it. So I was in there looking real close and found that cap. Some suggest multiple caps and diodes be replaced in the power supply, I'll add that one to the list.

[OldiesButGoodies]

The JD9 that cap is in has an audible hiss in it. Tried multiple different remedies - tubes, OP amps, rerouting wires, etc and so far nothing has tamed it. So I was in there looking real close and found that cap. Some suggest multiple caps and diodes be replaced in the power supply, I'll add that one to the list.

Scorpio - IMO you are overthinking this. "When I doubt, recap" - that is my motto. But seriously - why not remove the cap and test it?  For more than a basic test I acquired this thing from Amazon on the cheap:

https://www.amazon.com/Multifunction-transistor-Capacitor-Inductance-screwdriver/dp/B071Y5CHPK/ref=sr_1_7?ie=UTF8&qid=1525712694&sr=8-7&keywords=electronics+tester

Of course, I would rather have a Sencore cap analyzer like OCCD,  but this does well enough for $16, able to measure ESR etc. Also great if you have a bunch of similar caps built to a certain tolerance and wish to match several to lower tolerance for a left/right circuit recap.

OBG