Presence/Depth

Discussion in 'Amp Tech Center' started by aaronftnm, May 19, 2015.

  1. aaronftnm

    aaronftnm TDPRI Member

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    On an amp that is using negative feed back to control the presence could you change the capacitor value to make it control depth instead? I am asking because I think it would be cool to have a switch on a JCM800 to have a knob labeled contour and have a small switch next to it to switch between two capacitors, one value for depth and one value for presence.
     
  2. Cleeve

    Cleeve Tele-Holic

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    In a tube amp the negative feedback is mostly there to keep the bass response from being too peaky.. Since the treble isn't as big a problem, the Presence control is excellent- it just removes less negative, so more positive gets amplified!

    "Depth" is already a control name for tremolo (vibrato) and/or reverb.

    Wouldn't a control that made a lack of presence need to be called "Absence" ?
     
  3. aaronftnm

    aaronftnm TDPRI Member

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    Well, on my Jet City 20h there is a mod to add a depth control. I did the mod, and its hard to correctly explain what it does, but it seems that you can control the "tightness" of the bass. It helps dial in the low end depending on the volume that you are playing at. It seems like the the JCM800 I just built uses the same idea, a pot with a capacitor attached, to achieve similar results with the high end. I could be missing a part of the larger picture though.
     
  4. Wally

    Wally Telefied Ad Free Member

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