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Purpose of epoxy sealing pickups?

Discussion in 'Pickups & Electronics [BG]' started by KayXero, Jan 12, 2014.


  1. KayXero

    KayXero

    Joined:
    Apr 3, 2007
    Care of educate me? Ive done a search but am still confused. Ive noticed some pickups have this done, but wondered why. Plus it generally seems that rail and blade pups always seem to be the pups to have this done to them.

    I havent personally used traditional cylinder polepiece pups that are epoxy sealed (usually they are just glued). Heck, I dont even see cylinder polepiece pups anywhere searching online like that. So I guess I have two questions. What is the epoxy sealing for, and why do I see it generally on rail or blade type pups.
     
  2. Kmonk

    Kmonk

    Joined:
    Oct 18, 2012
    Location:
    South Shore, Massachusetts
    Disclosures:
    Endorsing Artist: Fender, Spector, Ampeg, Curt Mangan Strings
    It basically reduces noise and microphonics.
     
  3. mmbongo

    mmbongo Chicken Pot Pie. My three favorite things!! Supporting Member

    Joined:
    Aug 5, 2009
    Location:
    Upstate, South Carolina
    Mainly for protection. Also makes it near impossible to take apart and reverse engineer any trademarks or secrets that are inside.

    I would imagine the only reason you don't see it on exposed coil pickups is because the epoxy would run out of the open holes!
     
  4. line6man

    line6man

    Joined:
    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    Yep. It's called potting, and it is done to prevent microphonics.

    Epoxy holds up better than wax.
     
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  6. KayXero

    KayXero

    Joined:
    Apr 3, 2007
    Thanks for the info guys.

    Considering how hummy and noisy traditional pole pieces can be...is it really impossible to epoxy those? I know mmbongo mentioned epoxy running out of holes, but surely that could be prevented?
     
  7. MPU

    MPU

    Joined:
    Sep 21, 2004
    Location:
    Valkeala Finland
    The reason for traditional visible pole piece pickups hum is that they are usually single coils. Epoxy will do nothing for that hum.
     
  8. KayXero

    KayXero

    Joined:
    Apr 3, 2007
    Sweet. Im learning lol. Thanks for all the info guys. Im a noob when it comes to the nooks and crannies of a instruments electronics.
     
  9. line6man

    line6man

    Joined:
    Jun 20, 2008
    Location:
    Close to Los Angeles, CA
    Potting secures the windings so that they cannot vibrate. Pole pieces don't need to be potted, and are usually secure, anyway. Some pickups have adjustable pole pieces, so you certainly don't want them to be permanently affixed.

    Hum and microphonics are two different things, and hum is not caused by pole pieces. It comes from the coils, when nearby magnetic fields induce current to flow in them.
     

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