RIFA EMI caps [WAS: Re: VT100 PSU smelling.]

Pontus pontus at update.uu.se
Sat Jan 23 16:40:10 CST 2016

On 01/23/2016 01:26 AM, Tothwolf wrote:
> They can. The translucent yellow Rifa (now owned by Kemet) class X/Y 
> safety capacitors in particular have a 100% failure rate and are on my 
> replace-on-sight list. They usually begin to show visible signs of 
> cracking in their outer casing before they finally go out with a bang. 
> It seems to be due to chemical decomposition of the paper insulator 
> which swells over time and causes the case to crack. I usually replace 
> them with a film capacitor from Epcos of the same value and safety class.

I have heard similar from a few other places. And I'm replacing a five 
of these in a bigger SGI PSU as preventive maintenance. A few of them 
are showing cracks.

All I could find were new similar Kemet capacitors. Do you know if newer 
Kemet suffer from the same problem and I will regret buying them?


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