XPost: sci.electronics.design   
      
   I found a schematic of a stereo amplifier containing TWELVE 6L6 audio   
   output tubes. But aside from sharing the power supply, it's two   
   mono-blocks with each having SIX 6L6 output tubes. Unfortunately, I was   
   not able to get any real detailed information on this.   
      
   I compared it to several guitar amp schematics which use FOUR 6L6 tubes   
   in push-pull parallel, and this is very similar. It just has 3 tubes on   
   each side of the phase, rather than two. The plates are all wired   
   together and cathode / grid components are duplicates to each tube.   
      
   They did use as bias adjust potentiometer on each tube, which I have not   
   seen on the guitar amps.   
      
   Obviously the purpose is to increase wattage output.   
      
   I'm not intending on building this, but it's interesting and makes me   
   wonder if someone could use EIGHT 6L6 tubes, or TEN?   
   (Of course adding more tubes mean bigger audio output transformers and   
   heftier power supplies.   
      
   Another question that comes to mind is the impedience of the primary on   
   the audio output transformer. Assuming I could find a transformer that   
   would handle the wattage, would the impedence be the same as those used   
   with FOUR 6L6 tubes, or would that change since there are two more tube   
   plates connected in series.   
      
   Anyhow, looking at this schematic makes me think that any PPP amp with   
   FOUR tubes could have more output tubes added, as long as power supply   
   current is available and a suitable audio output transformer is   
   obtainable.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)