Electrolytics and Old Caps

[john]

If you read the fine print, those lifetimes are at
max spec'd ripple and max ambient temp.

While I don't disagree with your concern about Al Electrolytics,
the numbers quoted are not representative of normal usage!

73
John K5MO




At 07:49 AM 8/2/04 -0700, mike k wrote:
>
>Check out the specs for electrolytics - as rated in
>hours...  read them in the specs printed in Digikey
>and Mouser electronics catalogs, easy to obtain.  5000
>hours running continuously is less than a year!  and
>typical is 3000 hours...  and caps age (although
>differently) with power off.
>
>I met a guy years ago that refurbished old high-end
>home audio equipment.  BEFORE ANYTHING, even power up
>and test, he clipped out ALL the caps and replaced
>them.  not just electrolytics either.
>
>Older electrolytics were probably rated much LESS than
>our new caps.  So I doubt equipment with 30 year old
>electrolytics is running perfectly.  I suspect you
>would actually experience improved performance if old
>caps are replaced.  (power supply levels and
>regulation especially would improve.)
>
>Mike
>W2MK
>
>
>> : > I found it interesting that they recommending
>> discarding
>> electrolytics
>> : > that are older than 12 to 15 years old.
>> :
>> : Well, note that this is a MIL spec, money doesn't
>> count for much
>> with
>> : these guys... I have quite a few units that are
>> well over 30 years
>> old,
>> : still
>> : working perfectly with the original electrolytics.
>> :
>> : -- Ron
>> :
>> :
>> : >
>> : >
>> : > Regards,
>> : >
>> : > Marshall Dues,  WB5MYO
>> : > Katy, TX
>> : >
>
>
>
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