From: ohg...@gmail.com   
      
   On Monday, August 28, 2023 at 8:25:21 AM UTC-4, steve1...@outlook.com wrote:   
   I was fooled once by an old Leo3 computer power    
   > supply unit that had four 500uF electrolytics in parallel. It smoothed    
   > well until the last one failed.   
      
   The first time my Tek 7603 mainframe crapped out, one of the secondary   
   supplies was quite low.  This unit had like 6 huge Mallory caps in parallel   
   and I figured it couldn't be the caps, but like yours, it turned out they were   
   all open when I used my old    
   B&K to troubleshoot it.  All six.   They must have been dying off one by one   
   with absolutely no evidence seen on the trace until the last one croaked.  I   
   replaced just one of them to get me going and used it several years like that   
   until another group of    
   caps did the same in a different secondary of the power supply.  At that   
   point, I ordered all new electros and recapped the whole power supply.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)