XPost: rec.antiques.radio+phono   
   From: phil_a@tpg.com.au   
      
   "Richard Knoppow"   
      
   >>   
   >  Others have said that the caps are line noise filters.   
      
      
   ** Not me.   
      
   The action of the cap is to reduce the 60Hz voltage "floating" on the   
   chassis to a low value by  SWAMPING  the effect of stray capacitance in the   
   AC tranny windings and wiring.   
      
   Doing this prevents AC line noise entering audio input wiring and causing   
   hum modulation of AM and FM radio signals.   
      
   The same idea was used with most US made guitar amps that had only 2 core   
   leads.   
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)