SV20 presence knob noise

Discussion in 'The Workbench' started by Mach70, Jul 18, 2019.

  1. Mach70

    Mach70 New Member

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    My second SV20 Plexi head and both have had a noticeable scratchiness/ noise while turning the presence knob. Once it's at the place I want it, no noise. Is this inherent to this circuit ? Anyone else noticing this on their's? Thanks!!
     
  2. ken361

    ken361 Well-Known Member

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    Mine does it but I'm not worried about it:)
     
  3. Gene Ballzz

    Gene Ballzz Well-Known Member

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    @Mach70
    It is not unusual for a presence pot to make a little noise. If you understood what it is actually doing in a physical manner and from an electronic standpoint, you'd understand why! My crystal ballzz show some version of the three Studio Series heads in my near future. I just need to hope/wish/pray that one of my local shops ends up having all three in stock soon, for a good comparison! From most reports, I kinda leaning toward the same SV that you have!
    Just My $.02,
    Gene
     
  4. Mach70

    Mach70 New Member

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    Thanks guys, it doesn't bother me knowing it's inherent to the design. My Les Paul never sounded better, kudos Marshall for putting EL34's in the Studio Series!!
     
  5. assaf110

    assaf110 Well-Known Member

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    It is normal.
     
  6. ampmadscientist

    ampmadscientist Well-Known Member

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    It makes noise because there is DC on the pot.
    Sometimes amps are designed this way.
     
  7. Bloody Dave

    Bloody Dave New Member

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    Hello everybody,

    I'm new of the forum...mine has the same "issue", really glad It Is normal.
     
    Dogs of Doom likes this.

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