My personal preference with linear supplies is to just
plug it in and let any
bad electrolytics blow up :-).
This is not a bad idea, and reasonable for "modern" electrolytics (the
quality of components, especially electrolytics, increased greatly in the
1950s, thanks to the military). If something has not been turned on for 15
or 20 years - OK, maybe it is a worthwhile precaution, but nothing to go
nuts over. Otherwise, just a power up, perhaps with the supplies not
feeding anything, will almost always work. If a cap blows, chances are
great that it was failing due to another reason (moisture getting thru the
seals is a culprit), and would have blown at some point anyway.
All the years I have been doing this, I have never had an electrolytic
drastically fail, and have only personally seen it once on someone else's
equipment. The failure did not damage anything else.
Electrolytics from the 30s and 40s are a different story.
William Donzelli
aw288 at
osfn.org