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   rec.audio.tubes      Tube-based amplifiers... that go to 11      52,877 messages   

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   Message 52,250 of 52,877   
   Stephie Bench to All   
   Re: LTSpice, guitar amp tone control   
   25 Feb 14 11:07:47   
   
   From: sbench@aol.com   
      
   Generally, a true log taper is difficult to implement, so the mfgrs implement   
   it by two piecewise linear segments. The 10/90% allows 20 db change from mid   
   to max, a 30/70% allows a 10 db change mid to max. Note that a linear pot only   
   provides a 6db    
   change mid to max.   
      
   Patrick, the files I just emailed you are set up for a linear pot. I included   
   response curves for bass max, mid, min, 400Hz max, mid, min, and treb max, mid   
   and min.   
      
   I played wiyh the values a little, so, for instance response with all pots set   
   midscale, the response is:   
   50 Hz +7   
   100Hz +6   
   200Hz +2.5   
   400Hz 0   
   1k    +3.3   
   2k    +5.2   
   5k    +6   
   10k   +6   
      
   Bass at 50Hz Varies from +3.5 to +15   
   Mid at 400Hz varies from -9 to +9   
   Treb at 5k varies from +3.5 to +15   
      
   -Stephie   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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