1 PU, 1 volume, no tone guit & hum that goes away touching strings

Discussion in 'Luthier's Guitar & Bass Technical Discussion' started by jcs, Apr 21, 2016.

  1. jcs

    jcs Member

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    Where is the likely place to start with this guitar that hums until you touch strings or the Floyd Rose bridge?

    I just pulled this guitar out after many years (Japan Kramer Focus 1000) and its all stock except for a pickup change. Thanks in advance!
     
  2. gigs

    gigs Member

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    Make sure it is grounded properly. Plenty of youtube vids on the topic.
     
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  3. swiveltung

    swiveltung Member

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    Make sure there is a ground wire to the bridge/trem. If there is then:

    Shielding guitar hum


    I have had this issue with Teles a lot. Not sure why that is. As mentioned, ensure your bridge is grounded. It likely is though.

    To eliminate:

    1) use a shielded wire from the input jack to the pot.

    2) Shield the pickup cavities and the control cavity with metal tape. Aluminum from the hardware store is fine. Just do the easy shielding, it doesn't need to be 100% . Carry the shield out of the cavity and over the top edge a bit... maybe 1/8".

    3)Make sure all the pots are grounded together, take that ground to a small tab in or near the bridge pickup cavity. Solder the bridge ground wire to this tab also. This little tab is screwed thru the Aluminum tape. (Fender does it this way on their better guitars anyway.

    4) Put the Aluminum tape on the back of the pickguard if there is none. (doesn't need 100%) The goal is to have this tape contact the cavity tape (where it bends over the top of the cavity edge) when the pickguard is screwed down.
     
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  4. SamBooka

    SamBooka Member

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    You know that I'm goes away when the touch the string so it is grounded properly. Classic shielding symptoms.
     
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  5. walterw

    walterw Gold Supporting Member

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    ^
    yep, nothing actually wrong with it, and it was probably always like that.

    you can reduce the excess noise when you let go by making a project of shielding it, but real-world playing, you shouldn't have the guitar turned up without touching the strings anyway.
     
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