From: user@domain.invalid   
      
   On 20.02.2014 09:33, Patrick Turner wrote:   
   > Hi all. At 66yo, I have automatically been granted the license to be a   
   GRUMPY OLD MAN, acronym GOM, aka Experienced Curmudgeon or EC.   
      
      
      
   SNIP   
      
      
   > So, by having a Mid tone control one is drawn to effectively making a 3 band   
   graphic equalizer. It confuses many musos. Depends a bit on what kind of venue   
   and audience they play to. Perceived loudness of different F varies with   
   general average    
   loudness and there's a famous graph which sums it up in Radiotron Designer's   
   Handbook, 1955, written by wise old men.   
   > The Q of the 3 wanted bands differ; one would seem to want a higher Q for   
   mids. Well, to get that, perhaps the easier way for tone control is to do a   
   simple bass & teble Baxandal, and then in a preceding or following gain tube   
   connect a series resonant    
   LC circuit and pot between cathode and 0V. Thus it is not too hard to get +/-   
   9dB at 400Hz, Q = 1 or 2, while having it non-interactive with the bass and   
   treble controls. 100uF and 1.6mH become resonant at 400Hz, and   
   > L can be air cored.   
   >   
   > Just my 2c,   
   > Patrick Turner.   
   >   
      
      
   Hi Patrick,   
      
   are you reinventing the SVT/V9 Preamp from Ampeg?   
      
      
   regads   
      
   Jochen   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)