From: phil_a@tpg.com.au   
      
      
      
   To conclude, I did finally find some 5V4GA and those behave very much like   
   GZ32. Dropped the B+ voltage back to around 360v and this seems to work   
   well. Great sound. The transformers and choke get warm but not hot.   
   I am still trying to find out why Peter Walker's drawings say 340v. Perhaps   
   this was measured with the original QCII preamp drawing current. I dont have   
   one of those (yet).   
      
      
   ** The Quad 22 stereo control unit only draws 4.5mA from the HT of one Quad   
   II  -  plus 0.5A at 6.3V for heaters from both Quad IIs. The mono QCII takes   
   under half that.   
      
   So the effect on the HT is tiny.   
      
      
   I almost accidentally tried a 5U4G at first, until I checked my old RCA   
   manual. 3A heater! Using this in a Quad would NOT be good for the   
   transformer.   
      
   ** Probably do no harm, the heater voltage might be a tad low.   
      
      
   ....   Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)