Fw: Re[2]: Power Supply Problem

[W2OKF]

There is a section in my ARRL Handbook (1993 Edition, I think) that has
some good tips on bringing up Boatanchors.  There is even a circuit and
procedures for "reforming" electrolytic capacitors...Check it out...

Regards,

Walt, W2OKF
Foley  AL  36535

----------
> From: John Heck <jkh at LEXIS-NEXIS.COM>
> To: HEATH at LISTSERV.TEMPE.GOV
> Subject: Re: Re[2]: Power Supply Problem
> Date: Wednesday, October 08, 1997 8:13 AM
>
> Folks,
> Mike Phillips makes a reference to the first application of power to a
long out of
> use boatanchor. I think this is a somewhat confusing matter for a lot of
enthusiasts
> and its importance deserves periodic review. We are all constantly
accquiring new
> junk to play with and the first thing anybody wants to do is put power to
it. I think
> the first thing you should do when you buy a new piece of gear is to cut
the line cord
> off. Do it when you put it in your trunk. That will assure that you will
be forced to
> dig into the power supply a little and do some thinking before you power
it up. For
> one example, it is my understanding that the old Variac/cap reforming
procedure is
> not at all correct. For one thing, vacumn tube power supplies do no begin
to conduct
> until some lower limit of applied voltage is reached, like 75-80v or so,
and also that
> electrolytics need to be reformed under constant current until they draw
their rated
> voltage at that current. This is not going to be accomplished with a
variac, but needs
> a bench setup of some kind to monitor current/voltage and supply about
600v AC vari-
> able potential. I am *not* very knowledgeable about bringing up old gear,
and I wish
> someone who *is* would write us up a good procedure so we would have it
for reference.
> Would someone please do this for us??
> Regards,
> John Heck, KC8ETS
> 1009 Donson Drive
> Dayton, Ohio 45429
> (937)865-7036(work)
> jkh at lexis-nexis.com
>
> Mike sez:
>
> > Were does someone find a Variac?
> >
> > I've experienced the same problem described, HW101/HP23B.
> > Temporary solution was to swap power supplies, however, as my
> > collection grows so does the need for fixing the wayward HP23B.
> > Also, when powering up a purchase that may not have had power
> > applied for a length of time, I know it is wise to use a Variac
> > to allow electrolytics to reform. I've just never run accross a
> > Variac at swap meets, etc., or didn't recognize what it was.
> > Could some knowledgable soul educate me?
> >
> >                                     Mike (KE4HBA)
>
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