ELNA CE-W Soot on Bottom, Bad or Good Sign?

[jerdobi]

I have a 40 year old Pioneer SA-9500 with a couple of 18,000uF capacitors that I just replaced. The amplifier worked great with no issues with these capacitors, but they had a soot black coating on the bottom of the capacitor. These capacitors faced down, so this isn't from dust.

I just replaced anyway and wonder if anyone seen this discoloration before and if it's a good or bad sign?

[Sparkey55]

Re: ELNA CE-W Soot on Bottom, Bad or Good Sign?

That is somewhat normal for the rubber to oxidize that way. Just clean with alcohol and cotton swabs then let dry before powering up.

[Cartel]

Re: ELNA CE-W Soot on Bottom, Bad or Good Sign?

looks like cigarette smoke