From: sbench@aol.com   
      
   Hey Patrick,    
      
   Was thinking about your musings on a tone stack. On the LC 400Hz mid circuit.   
   A small inductor 1.6mH, only has a reactance of around 5 ohms at 400Hz. The   
   cathode Z is in the hundreds of ohms. Since Q in a series circuit is Q=X/R,   
   you can't develop enough    
   effective resonant Q to be useful. Might save you some disappointing results.   
   I do like the concept of the cathode series tank, but note that will give you   
   a boost only, not boost cut, unless you do a little switching. What might be   
   cool is to implement    
   all the tone stack that way. It might keep the interaction down too.   
      
   Also note that significant boost is difficult to achieve with RC only with   
   your proviso that 2 octave away has essentially no change in response. You'll   
   get at least a dB or so change that close. (Thinking of the 100Hz boost vs   
   400Hz no-boost.   
      
   Cheers,   
   Stephie   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)