Sanding pickup polepieces

Discussion in 'Pickups & Electronics [BG]' started by jesterbass, Apr 23, 2012.

  1. jesterbass

    jesterbass

    Apr 20, 2007
    Hello,

    I recently acquired a set of open polepiece passive Js to replace my closed type actives, for 5 strings. The pickups work fine, only problem is, the polepieces are radiused, and the radius is less than the one on my bass' neck. Result is the A string sounds a bit louder than the others. I was thinking about sanding down the polepieces for the A string to even out the output. The difference is not that much and a little will go a long way. Is it highly likely that I will make a mess with magnet shrapnel or completely ruin my pickups? They aren't exactly inexpensive. :) Can I expect a tonal change besides the output reduction, because I will have less polepiece material on? Any thoughts are welcome.
     
  2. SGD Lutherie

    SGD Lutherie Inactive Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    If you sanded the pole enough to make it shorter, it would get so hot as to ruin the pickup. I wouldn't do it. Also, Alnico is VERY hard, and takes quite a bit of effort to grind.
     
  3. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009
    alpha-music.com
    brittle, too; good chance of it crumbling.

    are you sure the string radius is right? the usual problem is just the opposite, that the outside strings are too hot.

    the fix is the same in either case; back the pickup away from the strings a bit more, to lessen the differences between one string and the next, evening out the outputs.
     
  4. SGD Lutherie

    SGD Lutherie Inactive Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    Also, the strings never match the fingerboard radius at the bridge end. Usually the low strings are higher. So try adjusting the string hight and then angle the pickup.
     
  5. I have seen some J pickups where the windings are not directly around the polepieces, so that you can tap them in slightly. I believe the Am Std Js of the 1990s are like that. But really would you hear the difference in a band situation? easier to lower and play with pickup heights like said before.
     
  6. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009
    alpha-music.com
    yeah, all the fender american standard pickups have poles insulated from the windings in a molded bobbin; you could push them right out of the pickup without hurting anything.
     
  7. jesterbass

    jesterbass

    Apr 20, 2007
    Thanks for the responses guys. The output is a little higher even after trying my best at angling both the pickups as well as possible. I am also taking tone into consideration (e.g. I don't like the bridge pickup loud at the high strings), but even if I didn't and tried setting up only optimizing for even output, I 'd still have the problem.

    The bass is a Warwick Streamer LX 5 string with a radius of 26". Pickups are Nordy Js with 12" radius iirc. Also I play with a pretty light touch so I can't have the pickups too low, the output is too low then.

    The bass has a 3d bridge that makes it easy to exactly "copy" the fingerboard radius to the strings, so it's pretty precise with respect to that.

    I didn't realize heat from sanding could ruin a pickup. Could I try taking it slow, cooling the pickup in between? I wonder if there's anything else I could do.
     
  8. mrbell321

    mrbell321

    Mar 26, 2012
    N. Colorado
    You might be able to soften the wax/glue and move the slide the offending pole pieces up or down as needed...
     
  9. You could also contact Nordstrand and ask them for advice? I think Maurillio or Mauricio works for them and he is here on TB.
     
  10. SGD Lutherie

    SGD Lutherie Inactive Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    That's not what I meant. All bridges with adjustable saddles can match the fingerboard radius. But that radius is for your left hand comfort, and has nothing to do with an idea setup.

    In a normal setup you raise the bass strings higher than the treble strings because they forum a wider arc when they vibrate. If you keep them as low as the treble strings they can choke when you hit them hard.

    Likewise, you lower the pickups under the bass strings because they are louder.
     
  11. iJazz

    iJazz

    Jan 9, 2012
    Sussex, WI
    Speaking ojn
     
  12. jesterbass

    jesterbass

    Apr 20, 2007
    ? :)
     
  13. iJazz

    iJazz

    Jan 9, 2012
    Sussex, WI
    What I meant to type was...

    Speaking of the topic of pole pieces, could a standard dark grey exposed pole be painted gold to match other hardware without affecting the performance of the pups?

    iJazz - When the phone rang I dropped the iPod and it all went to hell after that.
     
  14. SGD Lutherie

    SGD Lutherie Inactive Commercial User

    Aug 21, 2008
    Bloomfield, NJ
    Owner, SGD Music Products
    Yes
     
  15. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009
    alpha-music.com
    the question is whether said paint would last more than a month of gigs before flaking off, and also just what sort of gold paint would look like plated gold hardware and not like tacky gold-colored paint.
     
  16. 5bassman

    5bassman

    May 4, 2005
    Kennesaw,GA
    I contacted Nordstrand about this a few months back and he said to push the pole in to level it out, don't try sanding or filing.
     
  17. iJazz

    iJazz

    Jan 9, 2012
    Sussex, WI
    It occurred to me that gold leaf with some clear lacquer might have some hope of looking good and holding up.

    iJazz - Obsessing over detail planning for my project.
     
  18. jesterbass

    jesterbass

    Apr 20, 2007
    Did you try that? How did it go?