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Shielding Jazz Bass Bridge Pickup

Discussion in 'Basses [BG]' started by christopantz, Feb 11, 2017.


  1. christopantz

    christopantz

    Sep 16, 2015
    Hi everyone, I'm pretty frustrated right now.

    I just got done putting copper tape on the inside of my Jazz bass to shield it. It got rid of most of the buzz on the neck pickup, but hasn't made really any difference on the bridge pickup. It's a MIM Deluxe (Active) Jazz Bass. I soldered a ground wire going from the tape in the bridge pickup cavity to the tape in the main cavity, and I still can't figure it out. any tips?
     
  2. christopantz

    christopantz

    Sep 16, 2015
    It didn't completely work for the bridge pickup either, so any help on that would be great too.
     
  3. bdgotoh

    bdgotoh Supporting Member

    Aug 6, 2002
    Pacific NW
    Is the wiring from the pickups to the controls shielded?
     
  4. christopantz

    christopantz

    Sep 16, 2015
    I'm not sure what you mean, how would I check?
     
  5. NortyFiner

    NortyFiner Gold Supporting Member

    Mar 23, 2008
    Portsmouth VA USA
    When you shield a bass, you have to shield the entire routed cavity. The pickup cavities, the control cavity, anyplace where there's wiring.
     
    Aqualung60 and DiabolusInMusic like this.
  6. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Supporting Member

    Is this a noise that stops when you touch metal/strings/bridge or does it remain constant? Does the hum stop when you balance both pickups? If the noise persists when you touch metal/strings/bridge, then shielding will not have any impact on the noise.
     
  7. bdgotoh

    bdgotoh Supporting Member

    Aug 6, 2002
    Pacific NW
    You'll have to open up the control cavity. If the wires from the pickup are multiple individual skinny wires instead of one fat wire per pickup then that can gather hum which is then fed into the active preamp and amplified.
     
  8. christopantz

    christopantz

    Sep 16, 2015
    Hum disappears when i touch any metal on the bass, with both pickups balanced its still there
     
  9. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Supporting Member

    Shielding is the solution to your issue then. I would double check the ground wire under the bridge as well, ensure it has a good connection. Everything I know on the subject can be read in the link found in my signature. If there are any questions beyond that I am glad to help. I don't mean to be dismissive but literally everything I know on the subject is in that thread. I found myself repeating instructions so I made the thread.

    As far as shielded wire/routing goes, I don't bother with this. Fender pickups have exposed pole pieces. Unless you intend to cover them up with shielding as well, you will have a greater surface area from the exposed magnets than the wire route holes.
     
  10. christopantz

    christopantz

    Sep 16, 2015
    I've done everything besides the input jack cavity. should i shield that too?
     
  11. NortyFiner

    NortyFiner Gold Supporting Member

    Mar 23, 2008
    Portsmouth VA USA
    The input jack is part of the wiring, so yes.

    This, by the way, is why I usually pay a pro to do shielding on my instruments. It can be a real PITA to do it yourself.
     
  12. christopantz

    christopantz

    Sep 16, 2015
    Unfortunately I can't afford to pay a pro at the moment. Trying to make do with what I have.
     
  13. christopantz

    christopantz

    Sep 16, 2015
    I can't really think of anything else to do at this point. Shielding the input jack caused there to be no output from my bass so I had to remove that shielding. Aside from that I made sure the body cavities, bridge, pickups, were shielded. Even the battery compartment is shielded now.
     
  14. kulit17

    kulit17 Wal Collector #35 Supporting Member

  15. JoeWPgh

    JoeWPgh

    Dec 21, 2012
    Did you run a small piece of the copper tape up to reach the control plate?
     
  16. navijaz

    navijaz Guest

    Sep 20, 2016
    Maybe obvious, but worth asking...
    Did you check the shielding for conductivity in all areas, using a multimeter?
     
    RedJag, RSBBass, DavC and 1 other person like this.
  17. 9Thumbs

    9Thumbs

    Jul 3, 2013
    Near Boston
    Does this problem occur everywhere, or just in your living room? Sometimes the lights in a room can cause buzzing that just can't be stopped, particularly fluorescent tube lights.
     
    navijaz likes this.
  18. joebar

    joebar

    Jan 10, 2010
    if its a true single coil pickup, there will always be some residual hum when favoring one over the other
     
    DavC, DiabolusInMusic and Big Hoss like this.
  19. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Supporting Member

    Have you done the pickup surrounds? Have you grounded all the shielding?

    The control cavity must be shielded as well. If the shield touches the hot then you will ground out the signal.
     
  20. DavC

    DavC Supporting Member

    May 17, 2005
    Tallmadge , Ohio
    you can't stop the 60 cycle hum of single coils ... unless both are at full volume ... then they cancel the noise out ... i usually install Split Coil pups ... they sound most like singles , and then ad copper tape ... and i wrap it around the wires that go thru the wood and make contact with the copper tape in each cavity ..

    like others have said ... if you have a multi meter ... check continuity of all metal parts to make sure everything has a constant ground ...

    the copper tape is like a Faraday cage ... to help block radio/electrical waves interfering .... buzz ..

    if there are any light dimmers in the room circuit , they'll sneak some noise into things ... as will any CFL light bulbs ...

    quality shielded cables are a good thing also ... ( which doesn't need to mean, stupid expensive )
     

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