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GK MB150 question, boost knob

Discussion in 'Amps and Cabs [BG]' started by snowdan, May 3, 2006.


  1. snowdan

    snowdan

    Feb 27, 2006
    you know, there is this "boost" knob between EQ and chorus.

    the manual refers to it as "adding low end bite".

    so: is it really colouring the sound (boosting lows or so) or is it a sonically neutral gain stage?
     
  2. snowdan

    snowdan

    Feb 27, 2006
    still wondering.
     
  3. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    "Boost" controls gain going into a Class-A JFET gain stage. Turning it up allows you to push that stage into asymmetrical soft clipping, similar to a tube preamp. I don't think it boosts the lows, but I will measure it tonight and let you know.
     
  4. fdeck

    fdeck Supporting Member Commercial User

    Mar 20, 2004
    Madison WI
    HPF Technology LLC
    I checked it out with my free spectrum analyzer program. The "boost" control does not change the frequency response at all. It is purely a distortion knob.
     

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