Geek wrote:You can test it... place a 100K, 2W resistor in series and use a bench supply at its maximum rated voltage. Monitor the voltage across the cap. It should be steady. If it fluctuates, drops, or doesn't fully charge, she's a gonner.
Cheers!
Its not unusual to suffer a cap failure because it just happens from time to time. I had a Dynaco one time that I had purchased and it had a cap with about 5 hours of time on it and had one defective section in it. I didn't use that section and added another cap and its still running.