From: xtrchessreal@gmail.com   
      
   On Friday, August 4, 2017 at 11:37:24 AM UTC-6, johnn...@gmail.com wrote:   
   > In common power supplies the only example where there might be a problem   
   would be that using choke input. The choke likes to keep the current flowing,   
   so a switch between the rectifiers & the choke input could cause insulation   
   failure. But a switch on    
   the primary side as it normally would be is OK, the choke still has a way to   
   dump stored energy thru the PS transformer wdgs & rectifer.   
   >    
   > But choke input is now uncommon, most PS are cap input.   
   >    
   > In my case I installed the fix I spoke of in a regulated PS with DC standby   
   I built many years ago so that it can be run either in choke or cap input. The   
   max volts or current can then be used to advantage.   
   >    
   > Cheers to all, John L Stewart   
      
   its a 2204 Marshall circuit that I built, I added an LED between the input   
   filter and the standby, when switch closes and B+ hits the amp rail LED ON,   
   such that when switch is later opened the Caps discharge through the LED to   
   ground over a period of    
   several minutes, for safety when opening the amp e.g. to bias new tubes or   
   repairs, tweaks...   
      
   X   
      
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