From: Garey Barrell 
Subject: Re: [drakelist] L7 Amp renewal???


Garey Barrell  made an utterence to the drakelist gang
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Bob / John -

It has been my experience that if electrolytic capacitors don't "form" 
to full voltage within 5-10 minutes, they aren't going to and shouldn't 
be trusted. 

The most important thing is to limit the current available to prevent 
internal heating until the leakage current drops.  This is why I prefer 
the "light bulb" treatment rather than the Variac.  The "negative 
resistance" of the bulb limits available charging current.   The Variac 
method relies on incidental resistances to limit current, which may or 
may not (usually not in HV supplies), be adequate to prevent internal 
heating.

73, Garey - K4OAH
Atlanta


Bob Stewart wrote:

>
> Bob Stewart  made an utterence to the 
> drakelist gang
> ----------------------------------------------------------------------
> Hi John,
>
> Here is what I plan to do to bring the L7 back to life. The big issue 
> is forming the electrolytic capacitors in the power supply.
>
>
> 5.   Connect a variac transformer to mains power input to
>       the L7 Power supply..
> 6.    Begin with very low voltage output from the variac.
> 7.    Watch the EP reading and increase the mains
>        voltage input in small increments. I expect that this
>        may well take a day or so before the electro's are
>        formed.
>
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