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Re: Reforming caps

Posted by Raver (A) on December 28, 2003 at 04:12:35

In Reply to: Reforming caps posted by SteveBrown on December 27, 2003 at 14:25:44:

Steve,
I always replace all small electrolitics (under chassis) in vintage amps, but not necessarily the big filter caps over the chassis.
About Fisher, in the directions that come with his Fisher 400 Resto-Pack, the FisherDoc (Al Pugliese) writes:
"Generaly speaking, and contrary to popular belief, power supply electrolytics should NOT be changed unless they are leaking. They are remarkably long lived, and the more they are used, the better they behave. If the originals are in fairly good condition, the unit should be run with the existing filter caps in place. Often a flter cap will exhibit a small degree of leakage when the set is powered up. This "ripple" will often disappear as the set is used. Sets that have been idle for a year or more need to be run for a while which allow the filter caps to "re-form". If after a few months of steady use the ripple is still there, and if it's AUDIBLE, then the failing filter cap section should probably be by-passed by wiring in individual caps under the chassis, unless a suitable replacement is obtained. Generally speaking, ripple should be less than approx. 1cm with the scope set to 2v/cm.".
I hope this help
Raul

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