8ef3661d   
   From: nasadowsk@usermale.com   
      
   In article   
   ,   
    Corvette Bob  wrote:   
      
   > Hi Phil,   
   >    I just spoke with a gentleman down in Texas who used to sell tubes   
   > and other equipment and he too, said that a bad 12AX7 won't fire the   
   > 2050 but a ground on the 25v buss might.   
      
   I'll have to dig up my Q100/160 book next weekend at home and look.   
      
   > Hopefully, I'll find the   
   > ground and eliminate it during the rebuild and find the power   
   > transformer undamaged.   
      
   Oh yeah, that'd be bad :(   
      
   >  I was surprised to hear that I could replace   
   > the Selenium rectifier, cr501, with a silicon diode bridge without any   
   > problems. He also said I could do likewise for the sel. rectifier   
   > cr655 on the mechanism.   
      
   Hmm, been years since I saw one of those vintage mechs - which rectifier   
   on the mech was this?   
      
   > I thought I read somewhere that you couldn't   
   > replace a selenium rectifier with a silicon type diode, but must have   
   > misunderstood.   
      
   You can, but the lower voltage drop can cause issues.  Most notably, it   
   puts an AMI into warp drive.  You add a series resistor in that case to   
   slow it down a bit.   
      
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