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Re: [Amps] High-Voltage Electrolytic Capacitors

To: "EP Swynar" <>, <>
Subject: Re: [Amps] High-Voltage Electrolytic Capacitors
From: "Carl" <>
Date: Wed, 22 Oct 2008 14:07:30 -0400
List-post: <">>
How old are those "new" ones Eddy? Knowing you they are 1960's surplus!

Reforming is often only temporary and some significant leakage will 
return with use.

Use a low value equalizing resistor; 30-50K @ 10W and place far enough 
away so the caps dont get the heat.

Over time do a regular PM and feel the caps for excessive 
heating.......after discharged!


----- Original Message ----- 
From: "EP Swynar" <>
To: <>
Sent: Wednesday, October 22, 2008 1:59 PM
Subject: [Amps] High-Voltage Electrolytic Capacitors

> Good Day All,
> I blew a fuse in my 2x813 HB kilowatt the other day, due to a shorted 
> electrolytic capacitor in the filter "string" of the 2500-volts B+ 
> p.s. (the darn things are some 30 years old already, and owe me 
> nothing!).
> Anyway, scrounging through my junque box revealed a beautiful set of 8 
> matching aluminum canned electolytics (220-pfd. at 350 WVDC) that will 
> make a dandy back-up "plug & play" filter. I'm presently in the 
> process of "re-forming" them all, one by one, and it still continues 
> to amaze me just how long some of them take to "heal"...literally, 
> hours.
> I can only imagine what would sort of an explosion(s) may well have 
> ensued, had I elected to simply "plug in" the new filter bank after 
> the rectifiers, without first going through this process...
> It's tiresome, tedious work, but SOMEONE has to do it, I guess, Hi Hi
> ~73~ Eddy VE3CUI - VE3XZ
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