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Old 2nd June 2011, 09:08 PM   #11
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by nigelwright7557 View Post
If they are old then I would dispose of them anyway.
Cricklewood Electronics sell them new for 3-50 each.
I don't think so: large, unused caps tend to stay good for ever (I still have 22,000/70V Sprague's of the early seventies that are as good as new).
Some minutes reforming, and on they go....

I don't think modern ultra high density types would fare as well after 40y+ storage.

Let's meet in 2050 to check!
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Old 2nd June 2011, 10:00 PM   #12
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Quote:
Originally Posted by Chris Daly View Post
I have a Radio Spares Capacitor63v 10,000uf with no apparent polarity marking. Rather it has 5 terminals on its top, with a number sequence of 1, 2, 3, 4 Has anyone a data sheet or polarity identification info.

Cheers / Chris
those multipole caps should be standardised. Check the Vishay 051/053 pec-pw series for reference.
regards
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Old 3rd June 2011, 03:30 AM   #13
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I have heard back from Radio Spares they inform:

"Hello Chris Terminal is +ve and terminals 2,3 and 4 may be at negative
terminal
potential due to the presence of electrolyte. They are
intended for mechanical connections only. It is
recommended that they are soldered to the printed board

and picture of the capacitor:

Thank you to everyone who helped.

Cheers / Chris
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File Type: jpg 2011-06-03-121606.jpg (73.4 KB, 53 views)
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Old 3rd June 2011, 04:05 AM   #14
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by Elvee View Post
I don't think so: large, unused caps tend to stay good for ever (I still have 22,000/70V Sprague's of the early seventies that are as good as new).
Some minutes reforming, and on they go....

I don't think modern ultra high density types would fare as well after 40y+ storage.

Let's meet in 2050 to check!
Ive got some large cans from the 80's that I have reformed. Whilst they hold a charge, some loose voltage sooner than others. I expect that a new one would perform alot better than a 30yo cap.
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Old 3rd June 2011, 07:54 AM   #15
Mooly is offline Mooly  United Kingdom
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Thanks for pic...
They may be useful to keep for any "lash ups" but I don't think I would incorporate them in a new build... even if they are good, you probably couldn't replace them with identical ones.
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