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5-string "P-Bass" pickup question

Discussion in 'Basses [BG]' started by fishtx, Jan 13, 2012.


  1. fishtx

    fishtx Supporting Member

    Mar 30, 2007
    Dallas, TX
    Endorsing Artist: Genzler Amplification/Spector Basses/Mojo Hand FX
    Got a question for you pickup gurus out there.

    Are there known grounding or phasing issues with 5-string "P-Bass" style pickups since they are split unevenly (ie 3-poles on the top side of the pickup, and 2 poles on the bottom side)??

    I've got a 5-String CS Reggie Hamilton that has a lot of hum off the "P" style pickup (2-pole side) when I touch it. If I touch the 3-pole side, no hum.

    If I complete the ground loop (through my body) by touching the pickup with a finger of my right hand, and the strings on the neck with my left, the hum stops.

    I thought there may be a bad ground somewhere. I have opened it up and gone over it but can't find any loose or broken grounds (bridge ground is good, etc).

    Note there is only a single ground coming from the "P" pickup (off the 3-pole side...which does not cause the hum...hum only when I touch the 2-pole side).

    I hope this makes sense.

    Thanks.
     
  2. nukes_da_bass

    nukes_da_bass Banned

    Feb 19, 2006
    west suburban boston
    According to how i understand these things (which is poor at best), a P pickup is actually two pickups wired in series hence creating ONE split humbucking pickup. No noise should come if it is wired properly.
    I suggest you contact FMIC and ask them
    For two wiring diagrams- one for the pickup itself, and one for the entire preamp.
    It is at all possible the pickup itself is wired incorrectly.
    I bet replacements are available aftermarket, i got a deluxe 5 P from a vendor i found here at TB.
     
  3. mazdah

    mazdah

    Jan 29, 2010
    Kalisz, Poland
    Both my 4 string P-basses hum like crazy when I touch any pole piece of pickup (no matter which side)
     
  4. Fuzzbass

    Fuzzbass P5 with overdrive Gold Supporting Member

    There is nothing about a five-string P-bass pickup specifically that should contribute to hum. Note: many humbucking soapbars designed for five string basses are similar in that they are side-by-side split coils, one covering three strings and the other covering two.

    As noted by others, have the wiring checked. Also... avoid touching the poles. :p That's a downside to exposed-pole pickups. It is weird that it happens to one coil but not the other, though.
     
  5. fishtx

    fishtx Supporting Member

    Mar 30, 2007
    Dallas, TX
    Endorsing Artist: Genzler Amplification/Spector Basses/Mojo Hand FX
    Yes...that's weird...
     
  6. J-wall

    J-wall Supporting Member

    Sep 7, 2006
    Lawrenceburg, TN
    Try the pickup forum, nice and knowledgeable guys there. And, yes, there are issues with a 5 string P pup but I am not be best to explain it. More of a balance between the two "halves" but maybe hum issues as well.
     
  7. fishtx

    fishtx Supporting Member

    Mar 30, 2007
    Dallas, TX
    Endorsing Artist: Genzler Amplification/Spector Basses/Mojo Hand FX
    Thanks...
     
  8. RawOrange

    RawOrange Not really an orange Supporting Member

    Aug 19, 2009
    Southeast Wisconsin
    I know, old thread, but I am having this issue and it wasn't really "solved"

    Same thing is happening to me, except the pickup is a regular four string P-Style. Only one coil has the crazy buzz, and the other is fine. It is alleviated when I touch the back of the volume pot or other ground, but otherwise it is unusable. Any insight would be greatly appreciated!
     

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