Parts, & Parts Suppliers

[J M Fahey]

The refrigerator and tool holder type of flexible magnets definitely do have the magnetization in stripes of alternating polarity. I have measured this with my gauss meter, and also viewed it with viewing film. It is called Multipole magnetization. You are probably going to have to get the manufacturer to make it up special order with straight through thickness single magnetization. The '60's pickups that used this kind of magnet had the straight through thickness magnetization, I've rewound plenty of them. The other problem would be in getting some that is thick enough, most of what is available is in pretty thin sheets or strips. I have tried to re-magnetize some of the multipole strips from a magnetic tool holder strip with my commercial MAG-24C magnetizer, and it won't get rid of the multi-pole patterns.

Very interesting, thanks.

Just checked your magnetizer specs.
20000 AT per inch is perfect to magnetize *any* ceramic and yours offers 24000 (I guess thatīs where the "24C" label comes from).

So in principle you should be able to browbeat any ceramic, including relatively weak rubber bonded types, into submission.

That said, we have 2 Technical problems which might complicate that:

1) your magnetizer focuses its magnetic flux through a couple heavy iron jaws into a narrow long space, perfect for a guitar pickup, from rods inserted in a bobbin to a rectangular bar.

By the same token a piece of rubberized magnet will get a strongly magnetized area, same shape as magnetizer jaws, hardly a uniform field all over its surface.

Do you have some means of visualizing magnetic fields?
It would be interesting to magnetize a business card size piece of rubber magnet and check whether what I suspect is true or not.

If so, you might try drawing same piece across magnetizer jaws , while pressing the button that is, it "should" magnetize full surface uniformly, this creating a uniform "gold foil" magnet.
Worth trying, donīt you think?

I make my own speakers and currently have 2 brute force magnetizers, the third capacitive discharge one is in the works, can magnetize a 10cm or 15cm disk in a single hit but would love to know if the "sweeping magnet" method works ... since itīs within the possibilities of a relatively inexpensive machine, available to the average pickup maker.

Doubt the popular "passive" magnetizer based on small Neo magnets is strong enough for ceramics.

2) that said, maybe the alternating magnetic pattern is "dyed in the wool"

Meaning the rubber material is vulcanized/cured while under a magnetic field; in which case magnetic ferrite dust orients along flux lines, gets magnetized, and "trapped" in the now solid rubber.

Good to get stronger and well defined magnetic strips, hard to impossible to reorient.

Of course, exprimenting rules and yields the true results.

PS: almost forgot, can you please post the actual jaw dimensions?

That important value is not in the catalog, from pictures I estimate 2.5" or 3" wide by 3/8" high or so but canīt be certain of course.
Thanks.

[Helmholtz]

I have tried to re-magnetize some of the multipole strips from a magnetic tool holder strip with my commercial MAG-24C magnetizer, and it won't get rid of the multi-pole patterns.

No surprize, as the flexible magnets are based on ferrite/ceramic magnet particles suspended in a rubber-like carrier material. The high coercivity of ceramic magnets requires much higher demagnetizing/magnetizing fields than alnicos.

[SonnyW]

The refrigerator and tool holder type of flexible magnets definitely do have the magnetization in stripes of alternating polarity. I have measured this with my gauss meter, and also viewed it with viewing film. It is called Multipole magnetization. You are probably going to have to get the manufacturer to make it up special order with straight through thickness single magnetization. The '60's pickups that used this kind of magnet had the straight through thickness magnetization, I've rewound plenty of them. The other problem would be in getting some that is thick enough, most of what is available is in pretty thin sheets or strips. I have tried to re-magnetize some of the multipole strips from a magnetic tool holder strip with my commercial MAG-24C magnetizer, and it won't get rid of the multi-pole patterns.

[jsnace]

I seem to recall reading a post from Lollar that implied they do not.

[Helmholtz]

Do fridge magnets have a magnetization pattern and orientation suitable for PUs?

Clamping magnets often have multiple/alternating poles to increase clamping strength.

[big_teee]

All the craft stores, including walmart, sell sheet refrigerator type magets.
https://www.google.com/search?q=shee...w=1366&bih=576
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[J M Fahey]

Isnīt that basically same material as used in fridge magnets?

[jsnace]

Anyone have a recommendation/experience with purchasing sheets of rubberized Ferrite like what might be used in the American 60s gold foils?

[copperheadroads]

Yes the filter-tron kits are quite good .

[big_teee]

Mojo has 13% off of everything they sell until the end of October.
Which is a lot of different stuff. Amp parts, pickup parts, tools, etc.
https://www.mojotone.com/

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[John_H]

**I would love to try one of the Filtertron kits.

I've built a few of these Terry. They are quite nice.
Amplified parts is one of my favorite suppliers. The customer service is great.

[big_teee]

Amplified Parts & Antique Electronic Supply, has pickup parts 15% off, until the end of October, 2018.
https://www.amplifiedparts.com
https://www.tubesandmore.com/
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**I would love to try one of the Filtertron kits.
https://www.amplifiedparts.com/produ...n-nickel-cover
https://www.amplifiedparts.com/produ...tertron-silver

[Bodean]

Seems like no one has posted here in a while,
Where is everyone getting humbucker bobbins and base plates?

[big_teee]

MAGNET SUPPLIERS


Addiction-FX http://music-electronics-forum.com/a...price-2014.pdf
Magnetic hold http://music-electronics-forum.com/a...price-list.pdf
Tone-Kraft Guitar Pickup Bar Magnets
MojoTone Pickup Parts & Kits
Philadelphia Luthier http://www.philadelphialuthiertools.com/bar-magnets/

[big_teee]

Antique Radio has partnered with ebay seller Amplified Parts... good to check out all of their offerings like luthier tools.

Steve Ahola

I see that they are basically the same web site, with different names.
Amplified Parts also sells through Amazon.
You can order thru A. P.s with amazon and use your amazon billing info.
I bought fiber board from them thru amazon.
https://www.amplifiedparts.com/products/P-HFIBER-A
Good quality vulcanized fiber board.
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