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Delano preamp radio in a shielded bass

Discussion in 'Pickups & Electronics [BG]' started by jazzercountry, Jun 6, 2012.


  1. jazzercountry

    jazzercountry Supporting Member

    Apr 12, 2000
    Las Vegas, NV
    Endorsing Artist: Lakland Basses
    Hey all,

    Just got this system wired in to my Lakland and noticed that it's picking up radio. I shielded the whole thing with copper tape, could this be a grounding issue? I'm going to try isolating the pots from the shielding one at a time to see if that isolates something. I'm hoping that someone else might have had a similar experience and they can point me in the right direction.

    Thanks!
     
  2. jazzercountry

    jazzercountry Supporting Member

    Apr 12, 2000
    Las Vegas, NV
    Endorsing Artist: Lakland Basses
    It's only there faintly, and it's only really present when I boost the highs.
     
  3. bassbenj

    bassbenj

    Aug 11, 2009
    Try putting a small capacitor (30-100 picofarad which is a millionth of a microfarad) across the output jack or across the input of the input to your preamp. Or both places.

    The idea is to short radio signals to ground through the capacitor while not having it be large enough to change your tone.

    The reason for the one on the jack is that once the radio signals get inside the shielding they are very difficult to deal with. The reason for the preamp input is that it is the preamp input circuits that are detecting the radio signals and making them audible, so you want them shorted out there too.

    Don't get too discouraged. Eliminating RFI (radio frequency interference) is mostly magic anyway! Usually in difficult cases you just have keep trying small capacitors in different places until you find a spot the works.

    Good luck.
     
  4. jazzercountry

    jazzercountry Supporting Member

    Apr 12, 2000
    Las Vegas, NV
    Endorsing Artist: Lakland Basses
    I was able to kill it by lifting the ground wire from the bridge. Crazy stuff!
     

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