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Bart preamp - Cavity sheiding/grouding help

Discussion in 'Pickups & Electronics [BG]' started by Pure.Fusion, Nov 26, 2012.

  1. Pure.Fusion


    Dec 12, 2010
    Hi all,

    Well, this is embarrassing.

    I'm trying to install a Bart Preamp (Pictured Here )

    I've bench tested it with no problems at all but as soon as I install it into the cavity, no sound.

    Those exposed ground wires connected to star washers that are sandwiched between the pots and the cavity wall obviously have an issue with touching the black shielding paint on the cavity wall.

    My first though was to remove all the exposed ground wires and use insulated wire, as well as removing their connection to the pot chassis and effectively isolating the ground circuit from the cavity wall. Is this what I need to do for an active preamp / passive pup setup?

    Any help out there?

  2. pogipoints

    pogipoints Custom User Title Holder Supporting Member

    Dec 5, 2005
    What happened to me before was that one of the "hot" lugs from one of the pots was touching the copper shielding. You may try to check if any of the pots' lugs are touching the paint somewhere.

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