From: phil_a@tpg.com.au   
      
   "John L Stewart"   
   >   
   > And the rectifier system is symmetrical (FWB), so makes better use of   
   > the HV winding when compared to a full wave CT, something called Utilty   
   > Factor. As well, symmetry contributes no Power Frequency component (50   
   > or 60 Hz) to the rectified waveform, so easier to filter.   
   >   
   > All looks good at low cost.   
      
   ** Why not leave out the 6X4 completely and save even more cost -  it does   
   nothing really.   
      
   Simple fact is, the previously mentioned Chinese gent had a nice PT on hand   
   with a 6.3 volt heater winding ( no 5V) plus   
   a 230V secondary with no CT and needed to use a tube rectifier for   
   appearances sake to mimic the Champ schem.   
      
   So this cunning dodge with the 6X4 was his way out.   
      
   Reminds me of that famous Confucius saying.:   
      
   " Man who go to bed with stiff problem,   
    likely to wake up with solution in hand ".   
      
      
      
   ...   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)