ebd920f7   
   From: nasadowsk@usermale.com   
      
   In article   
   ,   
    Corvette Bob  wrote:   
      
   > Hi Guys,   
   >    I accidentally ordered a 5AU4 tube for the 5U4GB.   
      
   Uh oh....   
      
      
      
   > I read in a tube   
   > substitution list that the 5AU4 can be substituted for the 5U4GB.   
      
   No!  The filament current is .75 amp higher, for starters.  I think the   
   pinout's different, too.   
      
   > What I'd like to know has anyone tried this and if so, did it work?   
      
   I've never tried it.  5U4s are so common, and they generally don't go   
   bad.  Why are you replacing yours?  Unless it's physically broken, not   
   lighting up, or has a white, cloudy spot on the inside instead of   
   silver, chances are, it works.   
      
   > I'm using this in a Seeburg AY100U with the SHFA3 amp.   
      
   Fun fun.   
      
   >  It looks to me   
   > [I'm a tube newbie by the way] that the only difference is the   
   > filament voltage.   
      
   Current.  They're both 5 volts.  The higher current of the 5AU4 can burn   
   out the power transformer   
      
   >  Should I try to return the 5AU4 and get the correct 5U4GB?   
      
   Yes.  Actually, any 5U4 variety will work, though the GB might be   
   uprated slightly.  Actually, unless yours is broken, I wouldn't replace   
   it, they tend to last a long long time.   
      
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