Hi, I have a 74 strat that had three staggered magnet pickups, all with the same polarity and wind. I did not get hum canceling with that Strat, so i swapped out the center pup for a rwrp pickup.
I am wondering if I can take the original pickup and expose it to a very strong neo/d type magnet and change that polarity so i can throw it back in and get the hum canceling with the original pickup back in.
I am curious if that could be a permanent (or even temporary) solution. I really don't know. No harm in trying, of course ...
FWIW, when I was in the same predicament, I very carefully pried the magnet out and flipped it (CAUTION: this can damage the magnet, so be mucho careful and be prepared to bail on the idea if it looks like it's not going along damage-free). Then I ran hot to ground and vice versa.
You're still short one reverse winding to make it hum cancelling.
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The winding is not a problem as john says, reverse the conncetions makes exactly that effect.
Physically removing the magnet f the pickup is a real fender constrruction, ie flatwork with the wire around the magnets is ill advised, the wire is actually on the magnets not on a bobbin and the magnets are holding all together so that will destroy it.
I've not done it, but there is a stew mac thing on it, you need to move the pup between a very strong magnetic field with an air gap, you can arrange something like this with magnets in a vice but demagnetising and then reversing it rather than just magnetizing neutral alnico may be tricky and knowing that you have the required reverse to match the others may be problematic too. A little research is required as it is not enough/simple to just stick a magnet on it for a while to reverse the polarity.
If it is a 'bobbin' type thing, the poles are possible to get out, a vice can be used I believe to gently squeeze out the poles, but again, one needs to know that the pickup is made on a bobbin that supports the wire without the magnets and does not touch the magnets and so wont be damaged in the process.
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I made the mistake of removing magnets on a vintage style pickup SD and ripped the wire in doing so. I am sure this pickup would not survive the magnets getting pulled. So I realize the wiring is the easy part, just switch the wires. The polarity reversing of the magnets is what i proposing. You mention demagnetizing them first..... how does that work? What would be the sequence.
I made the mistake of removing magnets on a vintage style pickup SD and ripped the wire in doing so.
It's obvious this is an apples and oranges situation. D2O is talking about a pickup that has a bar magnet glued to the bottom of the pickup. Angelo is talking about a pickup where the polepieces ARE the magnets. While it's perfectly sensible to remove a bar magnet and flip it, one would never want to remove the polepieces from a pickup that has been wound.
I don't know that it's absolutely necessary to demag the polepieces. If you choose to do so, you would use a very strong AC field that is allowed to decay slowly. This will leave the domains in a state of relative disorder. I'd suggest connecting the two end of the pickup coil together during this process, to keep the voltage across the winding from becoming excessive.
"Charging" the polepieces is a straightforward process. Two extremely strong magnets are mounted on a fixture that will hold them apart.
The magnets are oriented like so: N-S | gap | N-S The gap is slightly greater than the length of the polepieces. The pickup is moved slowly through the gap and the domains of the polepieces will align with the strong magnetic field. In the example above, if the top of the pickup was on the left, it would result in a "north up" magnetization.