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RE: Is there an electrolytic capacitor shortage?




The amp is an 1990 Rega Elicit. I like its sound and it has a very nice MM/MC phono stage.

The caps are next to an heatsink that has a 80°C cut-off switch attached. It works (Trust me I know ;-) so the caps shouldn't be submitted to more than that. I measured the case temperature with an infrared thermometer and it is stable at around 50°C on my usual listening level. So perhaps a 85°C rated capacitor would do - However as it would operate close to its maximum rating, I fear their life expectancy would be reduced. I don't want to change caps every two years, and a cap failure might wreck havoc with the circuitry.

OTOH, the original caps are spec'd at 50V, so a 63V part would be voltage de-rated, which increases the temperature safety margin. The reason why I want to go with a higher voltage rating is that the schematics say that 48V is present on the filter cell. That is too close to 50V for my taste, especially since the mains here is specified as 120V -10%/+15%. That means these caps are subject to short periods of over voltage - That may be why they are failing.

Sorry for the long post, I'm thinking out loud :-)

-J

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