M7891-DC 2a fuse on +12? fixed!

From: vrs <vrs_at_msn.com>
Date: Thu Feb 5 18:12:53 2004

> > > To safely re-energize a piece of equipment that is long in the tooth
> > > and has been sitting around for some time, you have to bring the
> > > voltage up relatively slowly to allow the electrolytic caps to
> > > re-polarize. Everyone who is collecting should own a good-sized
> > > You power the box up by bringing the voltage from naught to the
> > > operational level with the Variac over a period of about a second or
> Then duck! IMHO opinion, and over 40+ years experience, to reform
> funky caps takes anywhere from a few minutes to over an hour, depending on
> many variables. If you think you've formed an electrolytic in one second,
> it was either tiny or good-to-begin-with.

When I read this, I took it to mean the Variac was a preferred method for
turning on equipment *after* the caps had been reformed, as a matter of
routine. (Otherwise it made no sense to me, based on what I know of
reformation.) That may not be a good idea, but I couldn't dismiss it out of

Received on Thu Feb 05 2004 - 18:12:53 GMT

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