From: sbench@aol.com   
      
   Hi John,   
      
   Very nice. A couple of comments. On the screen stopper, sometimes you can get   
   a "free" improvement in performance by tailoring the value of the stopper   
   resistor. I think, but I am not familiar with that tube, that a slightly   
   larger resistor may improve    
   the distortion, particularly at moderate power levels. The second comment is   
   the cathode bypass cap. Depending on its overall quality, bypasing that cap   
   with another non electrolytic,  say 1 or 10uF polyprop will both improve HF   
   performance, and often    
   lower distortion, since it removes the nonlinear effects of the cap.   
      
   Thanks for publishing those.   
      
   One further note in general note on low cost SE amps. By using a tetrode or   
   pentode connected in triode (or UL) mode, you often get the benefit of a   
   subtly better (more precisely, lower order) plate resistance linearity. This   
   often doesn't particularly    
   show up in static distortion measurements,  but under the condition of a   
   reactive load, it produces lower distortion. Nice benefit from using a "cheap"   
   tube. You can ve4ify this by making your static load reactive somewhat, and   
   measuring the distortion    
   in that condition.   
      
   Stephie   
      
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