From: phil_a@tpg.com.au   
      
   "Patrick Turneroid"   
      
      
   ** Another of the Turneroid's famous red herrings:   
      
   -------------------------------------------------   
   " Many Guitar amps have a hum nulling pot so hum from heaters can be nulled   
   but often is has no effect."   
      
   -------------------------------------------------   
      
   Actually, very few tube guitar amps have such hum pots.   
      
   1970s Fender 50W and 100W combos being the only ones of any note.   
      
   The trim pot always works ( if it has not burnt out ) but you have to KNOW   
   how to do the adjustment.   
      
   First step, fit an open circuit 1/4 inch metal sleeved jack plug in the No 1   
   input.   
      
   Second step, turn up the volume till you hear 50/60Hz and harmonics coming   
   from the speakers.   
      
   Then adjust the trim pot to minimise the audible effect.   
      
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)