a way to stop a pickup cover from affecting the tone

Discussion in 'Tele Home Depot' started by Cheap Trills, Oct 18, 2019.

  1. Cheap Trills

    Cheap Trills Tele-Meister

    Posts:
    445
    Joined:
    May 11, 2016
    Location:
    Brooklyn, NY
    I have a cool gunmetal blue single coil cover that I really like the look of, however it seems that it's made of some material that's greatly affecting the tone of the pickup. it's removing a lot of high end. Ultimately, sound matters most, so I decided I cannot use the pickup cover. However, I thought it worth researching if there was some way to keep it from affecting the magnetic field / sound of the pickup. I've found some info online about de-magnetizing it via a degauser, high heat, or suprisingly, hitting it with a hammer? but does removing it's magnetism even mean it won't affect the magnetic field?
     
  2. blille

    blille Tele-Afflicted

    Posts:
    1,178
    Joined:
    Sep 22, 2016
    Location:
    Bay Area - California, USA
    Never heard of anything that worked except removing the cover, making holes in it or making the cover be of plastic.
     
  3. jvin248

    jvin248 Poster Extraordinaire

    Posts:
    7,891
    Joined:
    Apr 18, 2014
    Location:
    Lions & Tigers oh Mi !
    .

    Put the cover on, get a capacitor (start with 0.047uF) and wire that in series with the pickup hot lead. That should brighten it up. You can also find a higher kohm volume pot to brighten but you may have other pickups that are not getting the cover.

    .
     
    preactor and Cheap Trills like this.
  4. PCollen

    PCollen Friend of Leo's

    Posts:
    2,463
    Joined:
    May 7, 2010
    Location:
    Man of the World
    I don't think that the cover itself is magnetized, unless perhaps when it is in close proximity to the pickup magnets underneath it...magnetized by proxy. If you remove the cover and set it on a table, will it attract other metal objects that are brought close to it like a magnet ?
     
    Cheap Trills likes this.
  5. Cheap Trills

    Cheap Trills Tele-Meister

    Posts:
    445
    Joined:
    May 11, 2016
    Location:
    Brooklyn, NY
    no, I think you are right, it does not attract metal objects. I guess it just interferes with the picups magnetic field.
     
  6. Cheap Trills

    Cheap Trills Tele-Meister

    Posts:
    445
    Joined:
    May 11, 2016
    Location:
    Brooklyn, NY
    putting holes in it? like on it's side? any idea what part has the most affect on the magnetic field?
     
  7. blille

    blille Tele-Afflicted

    Posts:
    1,178
    Joined:
    Sep 22, 2016
    Location:
    Bay Area - California, USA
    Top, sorry

    [​IMG]
     
  8. Ronkirn

    Ronkirn Doctor of Teleocity Vendor Member

    Age:
    73
    Posts:
    11,509
    Joined:
    May 1, 2003
    Location:
    Jacksonville, FL
    Different metals react differently with the magnetic field.. even what many think of as neutral metal covers can react badly... Aluminum for instance is NOT non-magnetic, its Diamagnetic, which presents its own issues... so ya can't just pick something arbitrarily, it has to be "engineered" for the application..

    A lotta suppliers havr no idea, they just contract and have something "out sourced", stock up on 'em, and promote them as the greatest not knowing that in reality they are the worst...

    r
     
    Cheap Trills, Barncaster and eallen like this.
  9. zeedoctour

    zeedoctour Tele-Meister

    Posts:
    312
    Joined:
    Feb 13, 2018
    Location:
    Texas
    You own a Fishcaster ? Nice ! If you don't want that gunmetal blue cover in the end, I might like it.
     
    Cheap Trills likes this.
  10. I_build_my_own

    I_build_my_own Friend of Leo's

    Posts:
    2,883
    Joined:
    Mar 9, 2012
    Location:
    New York
    Yep like that. Think of it like this (simplified): The magnetic “flux” needs to pass through the inner of the winding and get “distracted” by the strings and go all the way back ( on the outside of the coil) to the bottom of the mags. That delta of flux created by the distraction of the vibrating strings relative to the static magnet field creates the pickups output voltage. Any somewhat magnetic metal on top or the bottom of the coil will dampen the tone slightly - So if there is a some of the magnetic flux guided through the somewhat magnetically conducting metal cover right from the top of the poles to the bottom of the poles, it will never reach the strings - which will be audible especially for the weaker/smaller vibrations of the string that make up the higher frequencies.
    If you have cover like that in the picture that is already open on top you can make a vertical cut somewhere to suppress the potential “eddie currents” that otherwise circulate around and might also impact the signal... well that is the theory

    you will have much bigger results by probably using 1meg pots and a smaller tone cap to “ice pic” up the tone. Or use a series capacitor (high pass filter) as mentioned above.
     
    Cheap Trills, Barncaster and blille like this.
  11. RolandG

    RolandG Tele-Meister

    Posts:
    129
    Joined:
    Jul 31, 2015
    Location:
    UK
    If the cover is earthed then you can try cutting the earth wire to see whether that restores some of the top end.
     
    Cheap Trills likes this.
  12. rigatele

    rigatele Tele-Afflicted

    Posts:
    1,355
    Joined:
    Apr 20, 2014
    Location:
    Canada
    [QUOTE="I_build_my_own, post: 9377871, member: 82564"If you have cover like that in the picture that is already open on top you can make a vertical cut somewhere to suppress the potential “eddie currents” that otherwise circulate around and might also impact the signal... well that is the theory[/QUOTE]

    It is not only a theory - I proved it. (PDF): http://kenwillmott.com/blog/wp-content/uploads/2016/11/Pickup_Cover_Geometry.pdf
     
    Cheap Trills, bender66 and LowCaster like this.
  13. I_build_my_own

    I_build_my_own Friend of Leo's

    Posts:
    2,883
    Joined:
    Mar 9, 2012
    Location:
    New York
    It is not only a theory - I proved it. (PDF): http://kenwillmott.com/blog/wp-content/uploads/2016/11/Pickup_Cover_Geometry.pdf[/QUOTE]
    Awesome article!!! Love it.
     
    Cheap Trills and roffe like this.
  14. roffe

    roffe Tele-Meister

    Posts:
    232
    Joined:
    Aug 14, 2012
    Location:
    Stavanger, Norway
    Cheap Trills likes this.
  15. old wrench

    old wrench Tele-Holic

    Posts:
    893
    Joined:
    Feb 2, 2017
    Location:
    corner of walk and don't walk
    If the cover has a true gun-blued finish, then it is made from from some type of regular carbon steel.

    I've done gun blued finishes, and the chemicals used only work favorably with carbon steel.

    No good on stainless steel or nickle alloys like nickle-silver.

    I hope by narrowing down the metal the cover is made from it will help you find your solution to the problem :).


    g
     
    Cheap Trills likes this.
  16. Ripthorn

    Ripthorn Tele-Afflicted

    Age:
    37
    Posts:
    1,688
    Joined:
    Oct 22, 2009
    Location:
    Austin, TX
    Any material that induces eddy currents will affect it. Unfortunately, gun bluing only worked on materials that will do so. You can simulate the look, but you will need a material like wood or plastic.
     
    Cheap Trills likes this.
  17. Barncaster

    Barncaster Doctor of Teleocity

    Posts:
    10,914
    Joined:
    Feb 3, 2010
    Location:
    Northern California
    Ah yes, tuning the circuit to taste. It is the final step of any serious build. Great tuning suggestions provided all around gentlemen. Well done.
     
    Cheap Trills likes this.
  18. Cheap Trills

    Cheap Trills Tele-Meister

    Posts:
    445
    Joined:
    May 11, 2016
    Location:
    Brooklyn, NY
    thank you, all, for the input. After cutting into it, it looks to be alumium. I'm suprised it cuts off soo much high end. It actually sounds fairly sweet and mellow, but unfortunately that's not what I'm looking for in a strat neck pickup.

    I'm going to try a few experiments. I'll try moving it very close to the strings, since if the aluminuim is interfering, maybe its just acting like a pickup set too far.. although, the volume isnt cut. I'll also try grounding it to see if there's some difference.

    lastly, I have another of the same kind of pickup cover, and I've removed as much of the sides as I can. I'm curous if it will make a difference.

    IMG_20191020_1519202.jpg IMG_20191020_1534488.jpg
     
  19. Cheap Trills

    Cheap Trills Tele-Meister

    Posts:
    445
    Joined:
    May 11, 2016
    Location:
    Brooklyn, NY
    taking off the sides ended up having a large effect on bringing back the high end. I decided to see how much more I could take off. After all this, honestly, it's still cutting highs, but its somewhat pleasant.

    IMG_20191028_0953037.jpg IMG_20191028_0957547.jpg
     
IMPORTANT: Treat everyone here with respect, no matter how difficult!
No sex, drug, political, religion or hate discussion permitted here.


  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.