Capacitor spec's, choosing replacements...

dpb · 2015-06-29T21:48:51+00:00

I know there are some electronics guys here; I'm a nukeE by training w/ not much other than a basic circuits kinda' electronics background so am outta' my knowledge area here... Had an old ('69 vintage) receiver refurb'ed and the output coupling capacitors which were replaced failed after only a couple of months. The fella' who did the work has been doing this since '83 or so and says it's the first time in his experience he's ever seen such a failure. The schematic calls for 2200 uf/50V; those installed were actually 63V instead of 50V. Per his usual practice, he replaced them with 2200 uF/80 V/(I don't know temp rating I realize). The originals were ELNA CE-W but I have no idea what their actual spec's might have been. Anyway, the question is, anybody have any insight on what would be a reliable replacement for the originals with a likelihood of surviving more than a few months? I debated putting the originals back in as they weren't the actual failure point but electrolytics tending to degrade with time after 40 years seems that would be borrowed time, too...

Jun 29, 2015 25 Replies

Rate this thread:

dpb 11 years ago

On 07/01/2015 2:27 PM, snipped-for-privacy@snyder.on.ca wrote: ...

These _were_ 105C rated...

Vote

Tony Hwang 11 years ago

You missed three words, with that high value.

Vote

dpb 11 years ago

and @ 80V...

Vote

gregz 11 years ago

That might have been part of the problem. Higher voltage might be higher esr.

Greg

Vote

dpb 11 years ago

Possibly--so far I've been unable to determine a spec for the originals to compare...

Vote

clare 11 years ago

I have some 16 volt 1200uf 105c caps here that read 1206uf an 0.0 ohm ESR A bag of 10 volt 470uf that read 450uf and 0.27 ohm ESR (2% vloss) Have a 200uf 400 volt cap reads 213uf and 7.5 ohms ESR and a 8000 mfd

75 volt with a 1.9 ohm esr and 1.3% vloss

Just for data points and trying out my new component tester.

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required