From: phil_a@tpg.com.au   
      
   "Phil Allison"   
   >   
   > ** In about 1978, I acquired a used BWD 141 in excellent condition.   
   >   
   > Although capable of battery operation, a mains PSU came installed in the   
   > battery compartment. The vast majority of units made had this option   
   > fitted.   
   >   
   > The custom made, wire wound, reverse log, 15kohm dual potentiometer was   
   > the best thing about it and normally outlasts everything else. I still   
   > have two perfect examples, one in daily use.   
   >   
   > Because of using such a beautiful pot, BWD 141s have exceptional frequency   
   > stability.   
   >   
   > The typical THD is 0.05% between 100 Hz and 100kHz.   
      
      
   ** Stumbled on this web page that has internal pics ( high res too) and a   
   link to the schematic.   
      
      http://goughlui.com/?p=1343   
      
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)