[continued from previous message]   
      
   > But once you go to tubes and OPT, the OPT allows a normal amp to be   
   > made, and loading and linearity becomes much better than without OPT.   
      
   That's why I'm using an OPT. Otherwise, Nat Semi does a very nice   
   headphone buffer chip and I wouldn't need valves at all.   
      
   Ian   
      
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