Capacitor archaeology -- Elna CEW??

Christer · 1st February 2003, 05:08 PM

A friend of mine is considering replacing the filter caps in his
monoblocks. They have been powered on 24/7 for about 10
years, so that seems a reasonable thing to do. The problem is
that space is very constricted, so it is almost impossible to
find any caps with suitable values that fit physically. We have
managed to find one type that would fit, plain ordinary
Jamicons not claimed to be spectacular in any way. The obvious
question then is if there was anything special about the original
caps, which are Elna type CEW (now discontinued it seems),
that makes it questionable to replace them, despite the age.

BTW, the required spec for new caps is at least 15000uF 50V
and at most 50mm height (I don't think the diameter is that
critical). If somebody can recommend anything within these
criteria that is better than Jamicon, you are welcome, but
they should preferrably be available in Sweden.

fezz · 1st February 2003, 05:28 PM

hmm...

in gerneral better capacitors are bigger because they have thicker dielectric, and because capacitor sizes have shrunk over the 10 years, these should be better.

have yuo considered soldering a bypass capacitor to the underside of the pcb - it should improve things if the new capacitors are worse.

fdegrove · 1st February 2003, 10:02 PM

Hi,

If I'm not mistaken CEW has nothing to do with the Elna brand as such but is a way of expressing the sustained wattage the caps can endure.

I can't remember exactly what the acronym stands for but i'm sure I've seen it before on non polar caps for loudspeakers use.
Especially so on Asian ones.

Cheers,

Pjotr · 2nd February 2003, 10:05 AM

If height is of concern but the width is not: What about taking some smaller ones in parallel?

Cheers

1st February 2003, 05:08 PM	#1
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Capacitor archaeology -- Elna CEW?? A friend of mine is considering replacing the filter caps in his monoblocks. They have been powered on 24/7 for about 10 years, so that seems a reasonable thing to do. The problem is that space is very constricted, so it is almost impossible to find any caps with suitable values that fit physically. We have managed to find one type that would fit, plain ordinary Jamicons not claimed to be spectacular in any way. The obvious question then is if there was anything special about the original caps, which are Elna type CEW (now discontinued it seems), that makes it questionable to replace them, despite the age. BTW, the required spec for new caps is at least 15000uF 50V and at most 50mm height (I don't think the diameter is that critical). If somebody can recommend anything within these criteria that is better than Jamicon, you are welcome, but they should preferrably be available in Sweden.

1st February 2003, 10:02 PM	#3
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	CEW Hi, If I'm not mistaken CEW has nothing to do with the Elna brand as such but is a way of expressing the sustained wattage the caps can endure. I can't remember exactly what the acronym stands for but i'm sure I've seen it before on non polar caps for loudspeakers use. Especially so on Asian ones. Cheers, __________________ Frank

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1st February 2003, 05:28 PM	#2
fezz diyAudio Member Join Date: Feb 2002 Location: milton keynes, UK	hmm... in gerneral better capacitors are bigger because they have thicker dielectric, and because capacitor sizes have shrunk over the 10 years, these should be better. have yuo considered soldering a bypass capacitor to the underside of the pcb - it should improve things if the new capacitors are worse.

2nd February 2003, 10:05 AM	#4
Pjotr diyAudio Member Join Date: Nov 2002 Location: Netherlands	If height is of concern but the width is not: What about taking some smaller ones in parallel? Cheers