EMG jazz pickups and 60 cycle hum

Discussion in 'Pickups & Electronics [BG]' started by narud, Feb 1, 2013.


  1. narud

    narud Supporting Member

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    so i just installed some emg's in my main jazz that has a 2 band stingray preamp in it. tone is great. however i cant get rid of 60 cycle hum. its definitely not any type of ground buzz. if i point my bass in just the right location the hum will stop, but the majority of locations sound like a single coil being solo'd regardless of pickups settings. any ideas?
     
  2. narud

    narud Supporting Member

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  3. 20db pad

    20db pad

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    I been everywhere, man...
    Disclosures:
    I used 10" and 15" speakers in the same rig for over 10 years.
    How old of a Stingray pre? Maybe there's some componentry that has aged beyond normal use life? I imagine you have already grounded both the pre and the EMG pickups, even though EMGs don't typically need grounding.
     
  4. narud

    narud Supporting Member

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    ive got the same issue even with the pickups wired up to the supplied passive tone control. ive done multiple combinations of grounds, but im not getting ground buzz in the first place. its definitely 60 cycle hum. ive got an email out to emg but it was friday night when i sent it out so hopefully something will get sorted out. the tone is great and id really love to be able to use these pickups.
     
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  6. Stone Soup

    Stone Soup

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    Are the EMG's active or passive? If the noise disappears when you turn, isn't that a shielding issue? That shouldn't be a problem with active pickups.
     
  7. narud

    narud Supporting Member

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    standard set of active/stacked coil emgs. when i have ground issues with a bass (which i have in the past:smug:) the buzz is there regardless of position and isnt directional. my single coil jazz basses hum louder when i face my amp if a pickup is solo'd. these emgs do the same thing and it doesnt matter if theyre solod or both dimed.
     
  8. Stone Soup

    Stone Soup

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    Dec 3, 2012
    Curious. I could only guess it has to do with the preamp. I have EMG's in my P/J, but no preamp and they're silent. Sorry I don't have an answer.

    I'm interested in the solution EMG gives you. Subscribed.
     
  9. 57P

    57P

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    Did you use the output jack already in the bass or install the one that came with EMGs? And, are you sure the jack is wired correctly?
     
  10. narud

    narud Supporting Member

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    both jacks. used the previously functioning jack and the quick connects with the supplied jack.
     
  11. narud

    narud Supporting Member

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    i pulled the pre from the bass and have the same issue with the supplied tone control. im interested in what emg has to say too:D
     
  12. joelb79

    joelb79 Supporting Member

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    I have heard from Roger Sadosky posts here on talkbass that even on some EMG installs he has had to shield the bass and ground the strings before they were noiseless. He used to not connect the strings to ground because EMG suggested not to do this, but once the ground was replaced the noise went away and those basses were dead silent. Did you remove the ground wire to the strings?
     
  13. narud

    narud Supporting Member

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    i went through and read all that stuff too. removed ground wire, reattached ground wire, tried grounding the pre to different spots, changed how the cavities were connected etc. nothing. i can understand grounding helping noise, but this doesnt sound anything like ground induced buzz. its single coil hum. im starting to regret not just buying some dimarzios. i got seduced by listening to alex al clips.
     
  14. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Gold Supporting Member

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    If you touch metal/strings/bridge and the noise goes away you have a shielding problem.

    Just give the bass a proper shielding job and your hum will go away.

    Ensure you line the inside of the pickup covers (if possible) with copper foil tape and ground the foil from inside the covers to the foil lining the control cavity. Also ensure you do the pickguard and every bit of the body cavity. You can source copper foil tape locally at stained glass supply shops.

    I have never had hum I couldn't remove. You can quiet those puppies.
     
  15. joelb79

    joelb79 Supporting Member

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    You wouldn't happen to have clips of Alex Al playing EMG pickups would you? That would be great, I just saw a few clips of him and he smokes. None with EMG pickups though.

    Perhaps this is a problem with the way the preamp loads the pickups. If the input impedance is wrong that can induce tons of noise that acts this very same way. You might have to load the preamp with a capacitor before the preamp.

    What Musicman 2 band preamp? The self built uncle fluffy ones? Do you use the pickups included volume knobs before going into the preamp? Or any kind of blend knob or how is the wiring done? perhaps the problem lies in there. Also, X or normal J's. The preamp on the pickup might play into this, as EMG's have very different output impedance between the X and Non-X lines.
     
  16. narud

    narud Supporting Member

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    thanks for all the suggestions guys, but i cant stress this enough, this is not ground induced buzz. its 60 cycle hum. it sounds just like a bass with standard singles except they dont hum cancel when both pickups are dimed.
     
  17. DiabolusInMusic

    DiabolusInMusic Functionless Art is Merely Tolerated Vandalism Gold Supporting Member

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    If you touch metal/strings/bridge and the noise goes away you have a shielding problem.

    If If you touch metal/strings/bridge and the noise gets louder you have a grounding problem.

    This sounds like a shielding issue to me.
     
  18. narud

    narud Supporting Member

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    im having this issue with the standard vol,vol,tone setup with the emgs as well. its not a preamp interaction thing.

    its the homebrew uncle fluffy boards. it operates and wires up just like any other pre. its got an input and an output to the jack. you just put the two volumes before the input of the pre.

    i think i just went trolling youtube for the alex al stuff.
     
  19. narud

    narud Supporting Member

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    none of these are the situation thats occuring.
     
  20. joelb79

    joelb79 Supporting Member

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  21. narud

    narud Supporting Member

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    thats not the issue. the 25k resistor is there to simulate the 25k vol put that usually comes after the preamps output and before the jack since you usually wire a stingray pickup directly into the input of the pre. im already using the emg vol pots before the input of the pre. ive been using this pre in multiple jazz basses for a long time now with no problems.
     

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