Is it right that those capacitors have a life rating of 10,000 hours?
Rated 10,000 hours at 105°C, life of a capacitor doubles for every 10 degree Celsius decrease in temperature, that means the capacitor operating life at 55 °C is 320,000 hours! If a capacitor rated 10,000 hours at 85°C, its
operating life at 55 °C is 80,000 hours.
If this is truly a DC blocking capacitor for a power amplifier, then those capacitors are grossly under-rated for ripple current. That would lead to premature failure.
I will see if @clio09 has any of the original capacitors he can send me and if not I’ll buy the Nichicons as suggested and find someone local (if possible) to replace them.
Just a FWIW, if those caps are used in an application where they are seeing a higher voltage closer to their rated voltage (in the photo it looks like its in a DC Blocker to me, but who knows), I can tell you from experience that those Illinois caps can do that well short of the time you expect of them. Switching to a Nichicon will assure longer life. As @clio09 recommends, replace them with the same value and voltage.
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