Problem with 3band EQ

Discussion in 'Pickups & Electronics [BG]' started by metalli-guy, May 27, 2017.

  1. metalli-guy


    Mar 3, 2016
    Hai there. I've got my hands on a Stony "Sound of Rock Power" bass with a single active Musicman pickup with a 3-band eq. It's got a decent feel neck, nice hardware and an adorable flamed top.

    BUT, the sound is messed up. It works without a battery, but tone controls have no effect.
    I got this preowned, therefore it's safe to assume someone messed with the wiring before, and I can't seem to get it working right.

    The pickup has no markings, only thing I know about it is that it has only two wires coming out (hot and shield)
    The 3-band eq is a stp-001_amp-1 from Sung Jin Industrial Co.

    Can anyone point the direction of a wiring diagram I could use?
    Or do any of you guys have any pointers for me?

    Thanks in advance.
  2. 40Hz

    40Hz Supporting Member

    May 24, 2006
    Unless your preamp specifically has a passive tone control provision, you're probably stuck with just a volume control with the preamp switched off. There are a lot of preamps that don't have a passive tone control feature, including some of the more expensive ones.

    Odds are pretty good your preamp and wiring are ok. You just don't have a passive tone option.
  3. ddnidd1

    ddnidd1 Supporting Member

    The tone controls are part of the preamp circuit and require a battery to function.