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When the 1000uf cap shorts, it usually overloads the rectifier diode that feeds it. Fails as a short, now it puts AC voltage onto the DC-only electrolytic capacitor. Not good for it.

We got in the habit of replacing the rectifier diode whenever that cap is replaced. The time it takes to test the old one is more expensive than the rectifier diode. A new one won't be shorted and blow out a new cap.

The peak voltage that cap will see is no more than 18 Volts, so a 25-Volt rating is plenty high enough. Sounds as if the voltage rating has nothing to do with the premature failure you saw.

73

[QUOTE="nomadradio, post: 765635, member: 22"] When the 1000uf cap shorts, it usually overloads the rectifier diode that feeds it. Fails as a short, now it puts AC voltage onto the DC-only electrolytic capacitor. Not good for it. We got in the habit of replacing the rectifier diode whenever that cap is replaced. The time it takes to test the old one is more expensive than the rectifier diode. A new one won't be shorted and blow out a new cap. The peak voltage that cap will see is no more than 18 Volts, so a 25-Volt rating is plenty high enough. Sounds as if the voltage rating has nothing to do with the premature failure you saw. 73 [/QUOTE]

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