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Old 5th January 2006, 07:19 AM   #1
AndrewT is offline AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Question Reforming capacitors?

I am reforming capacitors for the smoothing banks of a variety of amps. Most are new old stock 2 to 3 year old. Some are much older and been out of use for 8 years.

Can I reform upto working voltage with a 1M2 series resistor without any risk?

Can I use a higher charging voltage and take the caps off charge when they reach working voltage?
Is there a risk of not reforming properly if the charge period is shortened to less than 24hrs or 12hrs?

Can I reform, slowly, to higher than working voltage, IF the reforming current stays low?
I'm thinking working voltage +10% through 1M2 resistor.
regards Andrew T.
Sent from my desktop computer using a keyboard
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Old 5th January 2006, 07:25 AM   #2
lineup is offline lineup  Sweden
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Join Date: Dec 2005
Location: the north
I didnt know you can reform caps.

I found this article
Steven W. Moore - Reforming Capacitors

At bottom of his page are two reference links, about same subject.

more links:

.... and from USA

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Old 23rd March 2008, 05:21 PM   #3
diyAudio Member
Join Date: Jan 2002
Location: Tyrone Ga. U.S.A.
I see we have a lot of threads on reforming caps but I
have another question. Can you reform a bipolar cap?
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