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What's the difference between a "Cut" control & a "Presence" control?

Discussion in 'Amp Central Station' started by homesick345, Nov 3, 2020.

  1. homesick345

    homesick345 Poster Extraordinaire

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    I don't mean how they work (clockwise vs anti-clockwise) I mean how do they differ in the amp topology/circuit as a function

    And how similar or different are they from a schematic point of view
     
  2. schmee

    schmee Doctor of Teleocity

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    Hopefully others who are better informed will answer this, but the Presence control adjusts the negative feedback a bit.
    The cut control may be different semantics depending on the builder. The Z Carmen Ghia tone control is said to be some sort of a "cut" IIRC and seems to simply remove lows in the mix. More of a "Fat to Thin" control.
     
  3. tubejockey

    tubejockey Tele-Holic

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    If we are talking about the typical Vox-style cut control, it is simply a low-pass filter across the output of the phase inverter. This will cut high frequencies regardless of the gain.

    A Fender-style presence control removes highs from the feedback loop. This means the low frequencies are a bit more compressed and clean as gain goes up, but high frequencies are left out of the loop. That gives the amp a bit more sparkle when the power amp is allowed to clip, thus it is a bit more gain-dependent.

    At lower gains, the two will have a similar feel, although obviously the capacitor values used will determine where the rolloff happens.
     
  4. gusfinley

    gusfinley Tele-Afflicted

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    Well said!
     
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  5. rze99

    rze99 Poster Extraordinaire

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    I've owned classic amps for decades and I've never known. I just turn the knobs till it sounds great.
     
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