From: phil_a@tpg.com.au   
      
   "John L Stewart"   
   >   
   >  ( snip )   
   >   
   > Depending on the loading conditions of a triode power stage, from 2/3 to   
   > 4/5 of this ripple voltage will be applied to the load. Unfortunately,   
   > most loudspeaker systems have one or two   
   > resonance's below 100 HZ. One of these could be at or near the power   
   > frequency. Presto!! We have objectionable hum in the listening room.   
   >   
   > Figure One illustrates an ordinary center tapped full wave power supply.   
   > Two sides of the HV winding measured 38 & 40 ohms.   
      
      
   ** FFS  -  just add 2 ohms to the 38 ohm winding.   
      
    Problem gone.   
      
    Dodgy 5U4s etc not withstanding.   
      
    SET amp loonies sure are a bunch of neurotic old women.   
      
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)