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  1. #1

    Default Magnet Swapping in a JB

    Hello all, I'm looking to get a little tighter low end out of the JB in my soloist, after hearing people talk about Alnico 8 magnets on the seymour duncan forums I figure I could try to swap the magnet instead of buying a new pup. Seeing as a magnet would be a lot cheaper than a new pup and I'm not looking for a huge difference in output or sound, just a tighter bass response. Has anyone here tried a JB with an A8 mag? If so, what did you think of it and where did you buy the magnet?

  2. #2
    JCF Member charvel750's Avatar
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    Nov 2002
    Jacksonville, Florida


    If you want more bass out of a JB wouldn't you want an Alnico 2 magnet? Going the other way like you're suggesting makes the highs greater, and the lows looser, right? Or, did you try a 250K ohm volume pot on it?

    And, are you sure you know how to disassemble the pickup, remove the old magnet, put the new one in, and then seal it all back up again? It's not exactly hard to do, but you can easily damage the pickup's coils if you don't know what you're doing...
    "Got a crazy feeling I don't understand,
    Gotta get away from here.
    Feelin' like I shoulda kept my feet on the ground
    Waitin' for the sun to appear..."

  3. #3


    I'm not looking for more bass necessarily, I'm looking for a tighter sounding bass response (less muddy). Supposedly Alnico 8 sounds quite similar to ceramic magnets in terms of bass response while keeping the highs more like an Alnico 5 (which I do like). I could be full of BS though .

    Apparently people on the seymour duncan forums have done A8 in a duncan custom or distortion, I would think that A8 in a JB would sound similar to the distortion with an A8 magnet. As far as taking it apart, that doesn't really scare me too much. I played around with disassebling an EMG HZ and was able to put it back together and it sounded just as bad as before .

  4. #4


    Just turn the bass down a bit on your EQ
    Fuck ebay, fuck paypal

  5. #5


    you can always try to swap the pickup with someone here, or sell it and buy one used to keep the costs down . that way you can get a pickup that is more suited to what you want to hear.
    "clean sounds are for pussies" - Axewielder

  6. #6


    Quote Originally Posted by wilkinsi View Post
    Just turn the bass down a bit on your EQ

    "clean sounds are for pussies" - Axewielder

  7. #7


    From my understanding swapping a magnet is actually easier than soldering in a new pup in most cases. No luck finding an A8 magnet that I can buy pre magnetized and without buying 10 or so at a time. There's a guy on ebay that sells lots of humbucker magnets and guys on the SD forums use a lot... but he's only selling A8s pre-magnetized in groups of 6 or something like that. I'll just keep looking I suppose.

  8. #8


    You can do that. With a ceramic magnet the JB tightens up pretty good, the Alnico 8 should do the same.

  9. #9


    Use a 300k pot that will do the same thing essentially.

  10. #10

  11. #11


    I've heard some talk about the UOA5s. Maybe I'll just buy a bunch of different magnets since they're cheap and start playing around!

    I have to replace the volume pot in my SL2H anyway, so maybe I'll do something with different pot values too.

  12. #12


    Post some feedback on what you did with what parts. Interesting for sure.

  13. #13


    I just bought 1M Audio Taper volume and 300k tone pots. As well as a couple UOA5s, A8, and ceramic mags. I'll post a new thread once I get it done since this has gone beyond the scope of just a magnet swap

  14. #14


    A 1 meg pot will increase the jb's output and its high end u newsroom go the other way to a 250k pot.

  15. #15


    Quote Originally Posted by groverj3 View Post
    From my understanding swapping a magnet is actually easier than soldering in a new pup in most cases.
    I find that extremely difficult to believe. For me, the hardest part of swapping pickups is installing the rings. Removing, and soldering 2 connections takes about 15 seconds.
    "Today, I shat a brown monolith ..majestic enough for gods to stand upon" BillZ aka horns666

  16. #16


    Quote Originally Posted by JACKSONFREAK View Post
    A 1 meg pot will increase the jb's output and its high end u newsroom go the other way to a 250k pot.
    Why would I go to a 250k volume? I'm trying to increase the output and tightness of the bass response, not decrease and muddy up the tone. Plus, I'm still not going to be running a 500k tone, the 300k should have more brightness than the stock 250k, but not the icepick high end of a 500k with a JB. Hopefully anyway. If i don't like it I can just put it back together the stock way, I have lots of 500k controls laying around.

    As far as swapping magnets vs. soldering. It's not that hard, unscrew the back plate, pull out the old magnet, orient and install the new magnet. Put back plate back on, and you're done!

    Anyway, once I get around to whatever it is I end up doing I'll post about it.


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