1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

Purpose of epoxy sealing pickups?

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

  1. KayXero


    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


    Oct 18, 2012
    South Shore, Massachusetts
    Endorsing Artist: Fender, Spector, Ampeg, Curt Mangan Strings, Nordstrand Pickups, Korg Keyboards
    It basically reduces noise and microphonics.
  3. mmbongo

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

    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. Yep. It's called potting, and it is done to prevent microphonics.

    Epoxy holds up better than wax.
  5. KayXero


    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?
  6. MPU


    Sep 21, 2004
    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.
  7. KayXero


    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.
  8. 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.