From: pfjw@aol.com   
      
   On Saturday, January 23, 2016 at 6:23:51 PM UTC-5, Patrick Turner wrote:   
   > On Tuesday, 19 January 2016 05:52:28 UTC+11, tub...@gmail.com  wrote:   
   > > Hello!   
   > > Which tube is equivalent to 1/2 12BH7?   
   > >    
   >  Mr Wieck typed....   
   >    
   > "The standard equivalent in use today is the 12AU7, with perhaps a little   
   bit less gain on the latter.   
   > There are those who find that they are indistinguishable as drivers in   
   low-power amps, favoring the 12BH7 over the 12AU in higher-power amps."    
   >    
   > Just who says the 12AU7 "the standard equivalent" to 12BH7? The 12BH7 has a   
   much lower Ra and higher Gm, and although both BH7 and AU7 are able to be used   
   in the same audio circuit along with 6CG7, the BH7 has a significantly higher   
   Ea swing because    
   the Ra curve for EG1=0 is a more vertical line than in the AU7 or CG7.   
      
   Snippage:   
      
   > Patrick Turner.   
      
   Two people on our little block are instrument amp types.    
      
   Explains much.   
      
   Peter Wieck   
   Melrose Park, PA   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)