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Alnico Magnet Strengths

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  • #1

    Alnico Magnet Strengths

    I wanted to amend this list as I found it very useful in getting started with building pickups. Kevin (Guitarforce) put in some work compiling it and was generous in sharing it in the first place. This is copied from the MLP forum but I know Kevin had put the info on this forum as well.

    Original Link

    My own finding from a recent batch of custom magnets are added in red. I also only wrote down the north face range from lowest reading to highest along the length. I found the North edge to be consistently the stronger side but it's easy enough to manipulate either face to read higher/lower when charging them.


    My Gaussmeter is the Spindoctor ER by GravitasTech.

    A2
    Before Charging (as they came) / Full Charge
    1. 554 North 486 South / 627 North 671 South
    2. 533 North 493 South / 635 North 671 South
    3. 446 North 457 South / 626 North 630 South

    A2
    1. 500-560 North / 669 Full
    2. 350-600 North / 759 Full
    3. 580-720 North / 739 Full

    A3
    Before Charging (as they came) / Full Charge
    1. 407 North 461 South / 531 North 534 South
    2. 407 North 465 South / 554 North 533 South
    3. 414 North 438 South / 541 North 543 South

    A3
    1. 400-460 North / 717 Full
    2. 260-719 North / 742 Full
    3. 478-474 North / 527 Full
    4. 120-450 North / 740 Full

    A4 Suppliers were out of stock when I placed order, sorry

    A4
    1. 607-803 North / 798 Full
    2. 601-822 North / 740 Full
    3. 548-604 North / 757 Full

    A5
    Before Charging (as they came) Full Charge
    1. 491 North 567 South / 927 North 930 South
    2. 611 North 598 South / 786 North 801 South
    3. 765 North 747 South / 721 North 796 South

    Unoriented A5 (UOA5)
    1. 714-845 North / 883 Full
    2. 763-825 North / 952 Full
    3. 707-746 North / 908 Full

    Oriented A5
    1. 1077-1092 North / 1121 Full
    2. 1026-1182 North / 1155 Full
    3. 688-752 North / 1153 Full

    Vintage 50's Long PAF A5? (Didn't mess with recharging yet; these numbers are straight out of the pickup)
    1. 430-550 North & 400-420 South
    2. 412-430 North & 500-514 South

    Vintage 61 Short PAF A5? (Didn't mess with recharging yet; these numbers are straight out of the pickup)
    1. 340-450 North & 440-580 South
    2. 330-500 North & 460-500 South

    A6
    Before Charging (as they came) Full Charge
    1. 644 North 621 South / 768 North 741 South
    2. 721 North 605 South / 838 North 915 South
    3. 633 North 576 South / 740 North 756 South

    A8
    Before Charging (as they came) / Full Charge
    1. 1171 North 1253 South / 1370 North 1494 South
    2. 1216 North 1336 South / 1469 North 1407 South
    3. 1297 North 1288 South / 1355 North 1368 South

    Ceramic 5
    Before Charging (as they came) Full Charge
    1. 1251 North 1259 South / 1251 North 1291 South
    2. 1252 North 1269 South / 1255 North 1287 South
    3. 1297 North 1210 South / 1293 North 1210 South

    Ceramic 8
    Before Charging (as they came) / Full Charge
    1. 1211 North 1216 South / 1219 North 1274 South
    2. 1141 North 1190 South / 1197 North 1221 South
    3. 1195 North 1204 South / 1242 North 1199 South

    Here's a link that shows my N52 Charging system and the magnets I was testing.
    Sigil Pickups ~ Stunt Monkey Pedals
    Tags: None
  • #2
    I think this is for bar magnets only, didn't see anything otherwise.
    Also I would be more interested in seeing the readings after a soak period.
    You show A3s as strong as A2s, and I have never found that to be the case.
    If you showed the gauss of each, A2 Compared to A3, a week later, after charging, we would probably see the real Gauss.
    Showing the gauss reading immediately after coming off the charger, IMO are inflated high readings!
    My $.02.
    Last edited by big_teee; 07-14-2014, 12:15 AM.
    "If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
    Terry

    Comment

    • #3
      Great post OP (and links), TY!

      Always interested in the technical whys/hows/wherefors!
      Start simple...then go deep!

      "EL84's are the bitches of guitar amp design." Chuck H

      "How could they know back in 1980-whatever that there'd come a time when it was easier to find the wreck of the Titanic than find another SAD1024?" -Mark Hammer

      Comment

      • #4
        Originally posted by big_teee View Post
        I think this is for bar magnets only, didn't see anything otherwise.
        Also I would be more interested in seeing the readings after a soak period.
        You show A3s as strong as A2s, and I have never found that to be the case.
        If you showed the gauss of each, A2 Compared to A3, a week later, after charging, we would probably see the real Gauss.
        Showing the gauss reading immediately after coming off the charger, IMO is an erroneous reading!
        My $.02.
        I was thinking exactly this but wanted to show the charges right off the Neos anyway. It's been a while since I took the initial readings so will go check and see if I marked the magnets when I put them back on the bricks. Regardless, I'll do a few more sets and see how they hold up after a week or so.
        Sigil Pickups ~ Stunt Monkey Pedals

        Comment

        • #5
          Originally posted by CheopisIV View Post
          I was thinking exactly this but wanted to show the charges right off the Neos anyway. It's been a while since I took the initial readings so will go check and see if I marked the magnets when I put them back on the bricks. Regardless, I'll do a few more sets and see how they hold up after a week or so.
          To All. . .

          Can any share their knowledge as to why the charge levels/potential on unoriented A5's is significantly less than for oriented A5's? Are there situations where it would be preferable or more suitable to use one vs the other in a pickup?

          Just curious. . .
          Last edited by kayakerca; 07-14-2014, 03:17 PM.
          Take Care,

          Jim. . .
          VA3DEF
          ____________________________________________________
          In the immortal words of Dr. Johnny Fever, “When everyone is out to get you, paranoid is just good thinking.”

          Comment

          • #6
            The oriented magnets have a charging field introduced during the casting/cooling process to get them to be pre-biased. I have to do more testing to see the real impact on tone.
            Sigil Pickups ~ Stunt Monkey Pedals

            Comment

            • #7
              Originally posted by kayakerca View Post
              Can any share their knowledge as to why the charge levels/potential on unoriented A5's is significantly less than for oriented A5's?
              Alnico - Wikipedia, the free encyclopedia

              Here you can find the skinny about alnico mags. Look isotropic and anisotropic in manufacturing process.

              HTH,
              Pepe aka Lt. Kojak
              Milano, Italy

              Comment

              • #8
                I checked my magnets and I did mark the one's I tested so here's the current info after ~1 month sitting in the brick.

                A2
                1. 500-560 North / 669 Full
                2. 350-600 North / 759 Full
                3. 580-720 North / 739 Full

                And after sitting for a month:
                1. 554 North 569 South
                2. 651 North 576 South
                3. 560 North 554 South


                A3
                1. 400-460 North / 717 Full
                2. 260-719 North / 742 Full
                3. 478-474 North / 527 Full
                4. 120-450 North / 740 Full

                And after sitting for a month:
                1. 442 North 449 South
                2. 493 North 473 South
                3. 422 North 453 South

                A4
                1. 607-803 North / 798 Full
                2. 601-822 North / 740 Full
                3. 548-604 North / 757 Full

                And after sitting for a month:
                1. 765 North 716 South
                2. 680 North 710 South
                3. 708 North 708 South

                Unoriented A5 (UOA5)
                1. 714-845 North / 883 Full
                2. 763-825 North / 952 Full
                3. 707-746 North / 908 Full

                And after sitting for a month:
                1. 817 North 832 South
                2. 712 North 728 South
                3. 782 North 743 South

                Oriented A5
                1. 1077-1092 North / 1121 Full
                2. 1026-1182 North / 1155 Full
                3. 688-752 North / 1153 Full

                And after sitting for a month:
                1. 1046 North 1031 South
                2. 1047 North 1041 South
                3. 983 North 988 South
                Sigil Pickups ~ Stunt Monkey Pedals

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