From: lugnut808@spam.yahoo.com   
      
   On 28/08/2023 9:29 pm, Dan Green wrote:   
   > Hi all,   
   >   
   > Is this okay? I'm talking about replacing electros that have been in   
   > service for like 30+ years and which have a rep for failing by then   
   > (Frako caps) with old but unused electrolytics; so called "new old   
   > stock" caps of reputable manufacturers of the same spec. I can't see   
   > an issue with this but am no expert so.... what d'yall think?   
   >   
   > Dan.   
      
      
   Electrolytics tend to get leaky over time if stored with no voltage   
   across them. When voltage is applied after a long time in storage, an   
   unusually high leakage current will flow until the insulating film   
   reforms. If they have been stored long enuogh, this re-forming process   
   can draw a lot of current and make the capacitor get hot and go bang.   
   For this reason it is best to do it with a current-limiting resistor. If   
   you are intending to store electrolytic capacitors for a long time, it   
   might be worthwhile making provision to charge them periodically to   
   prevent them from becoming leaky. Similarly, it is worth powering up   
   stored equipment on a regular basis to re-form the capacitors in the   
   equipment so that it doesn't go bang when powered on after a long period   
   of being off.   
      
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