First of all, Im glad to see some activity here on old Usenet. Most people   
   seem to be in web based forums these days.   
      
   In my description of the DC supply, I meant that instead of using the existing   
   16+16uF cap, I placed two separate caps in the circuit - one 33uF before the   
   choke, and a 47uF after. I did not add another choke or anything.    
      
   Phil, thanks for sharing your experiences while I was working on the amps.   
   Since I do not own a dozen of them I could not check what would be the normal   
   behaviour of the circuit.   
      
   Patrick, I have read your interesting site about tube electronics. I   
   understand your angle, and I think it is how one should think about new   
   production amps. But in these Quads I was more concerned with safety and   
   longevity than altering the circuit.    
      
   I saw a Quad system in a museum recently, together with an early EMT   
   turntable, SPU cartridge, a Revox G36 and so on. Special, quirky but high   
   quality stuff that must to most people seem like steam engines these days.   
   Call me sentimental but I personally    
   dont want to alter such machines too far from how they were made in their   
   time.    
      
   I understand the problem with the common cathode resistor, and I wonder if   
   maybe this is one of the reasons many Quads have failed with melted tar all   
   over. In my amps I swapped tubes around and measured voltage differences for a   
   little bit better DC    
   balance. But separated cathodes sounds like a good idea.(I built a Williamson   
   inspired amp once, using huge wirewound pots between the two output tube   
   cathodes and ground. Was easy to balance but maybe not the last word in   
   highend audio :)   
      
   It would be interesting to hear more ideas about how to make Quads safe for   
   future use and longevity. I understand it is not a good idea to put a fuse   
   between the HT center tap to ground?   
      
   Martin   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)