> ** German products once used an odd IEC like connector with two pins and    
   >    
   > ground via the casing.   
      
   Interesting, could be that they were German imports since Im in Sweden. Or   
   they picked up the same specs here. All I know is that they were at least not   
   used in broadcasting studios since they would have had a special cutout part   
   of the chassis then.   
      
   > Same panel cut out I think, see them on old "Dynacord" amps and " Echolette"    
   >    
   > tape units from the 1960s.   
      
   And Leitz Focomat photo enlargers from the 60's:)   
      
   > Im in two minds about the Jones connector.   
   > On one hand it looks retro funky.   
   >    
   > ** Huh ?   Looks appalling to me.   
      
   The think is, the Jones plug does not look hifi at all, just sort of vintage   
   industrial. I think it fits to the general design of the Quads. But I thought   
   of changing it to a phono anyway to make it more usable for future users (and   
   yes I hope these amps    
   will last another 50 years)...   
      
   > The only giveaway that the amps have been modified is that I placed AC    
   >    
   > switches where the fuse holders were. But they are old British chromed    
   >    
   > switches and look contemporary. The fuses are now inside the enclosures.   
   >    
   > ** You have just given me an idea....   
   >     
   > ....  Phil   
      
   Old Bulgin switches have nicely ribbed chrome rings. But I have seen different   
   fuse hole sizes in Quads. Im mine they fit precisely.   
      
   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).   
      
   For other readers coming by, I can try to sum up my Quad II rectifier   
   experiences so far:   
      
   5AR4/GZ34 are great but can result in excessive voltage! Do measure your amps   
   if you are running these. I had around 385v at the first cap, which could be   
   bad in longtime use depending on ones tubes, caps and resistors. They need   
   just 1.9A heater current    
   which is good, though. I had installed new computer grade caps of 33uF and   
   47uF @ 450v which may have given different results than using the original TCC   
   16uF caps in the grey box.   
      
   GZ32 and 5V4G/GA seem to make it just right at 360v. Especially 5V4 has a 2.0A   
   heater which is better than GZ32. Indirectly heated. The closest approach to   
   the original specs;)   
      
   5R4GYA is a directly heated rectifier, and the B+ voltage comes on instantly   
   and can peak at over 400V. Was not a problem for me, no arcing or anything,   
   but I dont think the output tubes will like such treatment forever. Best would   
   be to have standby    
   switch. B+ after warmup became 340v just as in the original drawings. This   
   tube also has a 2.0A heater and worked well otherwise. The coolest running   
   Quad II rectifier combination: My amps did not get very hot even after hours   
   of use.   
      
   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.   
      
   Also note that I was only using vintage tubes. I dont know how the new Chinese   
   or Russian ones will behave.   
      
   I hope I got all the numbers right.   
   /Martin   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)