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[AMPS] SSR's reforming electrolytic caps

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Subject: [AMPS] SSR's reforming electrolytic caps
From: (
Date: Mon, 3 Jul 2000 20:15:09 -0700

One of the reasons I asked about users of SSR's in Amplifier 
power supplies, was my interest in their off position leakage.  

I often rebuild amplifier power supplies with older electrolytic 
capacitor banks on board. I worry about these capacitors when 
they sit idle for extended periods of time.  

I'm in the process of working up a capacitor reforming mode 
for power supplies using electrolytics.  The goal of this mode 
would be to provide a very slow ramp up toward the normal HV, 
allowing the capacitor to reform before the amplifier is step 
started for operation. The amplifier would not be available for 
operation during the reforming process. 

I would hope this 1st ps mode would avoid "shocking" a long 
time unused electrolytic cap and avoid a premature failure.  

It is possible the leakage of a SSR could be counted on to ease 
the "shock of a "long time idle" electrolytic capacitor. The HV power 
supply may ease up some value (say a few hundred volts) in 
the off mode with the line breaker(s) on.  

You could consider it a side bar benefit of using an SSR in HV 
circuits. Thanks to all the folks who provided information and 
their colorful opinions. 

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