From: apogosso@tpg.com.au   
      
   "Trailboss"  wrote in message   
   news:5LZhq.4068$rB3.2333@newsfe02.iad...   
   > Patrick,   
   >   
   > Words of wisdom, well said.   
   >   
   > Would you have any idea why HP would use a 900 volt cap in this ckt?   
      
   There is a line of thinking that if the rated voltage is higher, then the   
   leakage at lower voltage will be lower.   
   Possibly, it might be generally true for new paper caps, for old paper caps   
   leakage grows over the years irrespective of the rated voltage.   
      
   For modern plastic film caps the leakage is negligible. You do not need   
   excessive voltage rating for nothing. 630V is too much and makes the cap   
   unnecessarily large and expensive. Probably 250V rating is OK, depending on   
   the maximum voltages in the circuit (when all the tubes are pulled out,   
   except for the rectifier).   
      
   >   
   > Plate Voltage of the 6AU6 is 110vdc coupled by the .5 micro F to the grid   
   > of 6AQ5.   
   >   
   > TIA   
   > Vin   
   >   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)