P-90 Question?

[markeymark]

Has anyone tried making a P-90 with atracting polarities facing each other against the keeper bar? (South, North vs North, North)

Peace

[OFM]

Has anyone tried making a P-90 with atracting polarities facing each other against the keeper bar? (South, North vs North, North)

Peace

Probably you won't get any sound (actually the pickup may sound, but at very low volume) since the keeper bar will be virtually demagnetized with opposite magnets polarities...

(Correct me if i'm wrong, please...)

[EtLa]

Has anyone tried making a P-90 with atracting polarities facing each other against the keeper bar? (South, North vs North, North)

Peace

At Seymour website
http://www.seymourduncan.com/support...and_a.shtml#11

11. I took my Gibson P-90 (Soapbar) pickup apart and now it has little output but the coil still reads 7.3K ohms.
This is a pretty common problem with pickups using two magnets like the Gibson P-90. In your case, the magnets are not put back into the pickup right. What is important to remember is that each magnet has a South Polarity (S) and a North polarity (N). The same polarity (both South or both North) shoud face each other (they will repel each other). Normally Gibson P-90’s have both South (S) polarities facing each other. The pickup has a metal spacer on the bottom, below the bobbin, that conducts the magnetic field to the adjustable polepiece (5/40 fillister head) screws. Both the magnets South (S) polarity faces the metal spacer. To make the P-90’s act like Humbuckers when both pickups are used, reverse the Hot and Ground wire on the neck pickup and flip over the two magnets 180? degrees. This will make the the pole pieces have a North (N) polarity. The two magnets North side face the metal spacer that conducts the magnetic field through the poles.

[markeymark]

I just pulled a P-90 Rio Grande apart and it had both north polarites facing the keeper bar.(opposing polarities) It seemed strange but I guess its right for the p-90.

What would it sound like with attracting polarities facing the keeper bar? (North to south with the keeper between them)

I'm talking about the 2 bar magnets in each p-90.



Thanks

[markeymark]

I think I see the reason now why they use opposing polarities with the magnets. (Pole peices south, coil north-Gibson placment)


(I guess i'll have to use epoxy to hold the magnets in place.)

[OFM]

(I guess i'll have to use epoxy to hold the magnets in place.)

No, it's not necesary to glue them... remember that you're facing 2 north (or south) polarities against a magnet conductor, not against the magnet itself...

[markeymark]

Thankyou!

Peace

[NightWinder]

You better glue them Mother fuckers in place! Be squeling like a banshee in no time. Why risk the vibration factor.

[madialex]

You better glue them Mother fuckers in place! Be squeling like a banshee in no time. Why risk the vibration factor.

I use clear silly cone, ha, like the speeeling, um spelling

[David Schwab]

I just pulled a P-90 Rio Grande apart and it had both north polarites facing the keeper bar.(opposing polarities) It seemed strange but I guess its right for the p-90.

It's not strange at all. You want the same polarity facing the keeper so that the flux is aimed up the pole pieces. This is the same way the steel poled Strat pickups work. Just think of it that the two magnets are working as one.

What would it sound like with attracting polarities facing the keeper bar? (North to south with the keeper between them)

The magnets will basically short each other out, and no flux will go up the poles.

[Spence]

actually, a P90 with poles attracting will have an output. You have assumed that both magnets are of equal gauss. They will not be. i have tried this but the pickup was quite weak.

You do not need glue, silicone, silly putty, eskimo sperm or anything else to hold the magnets down. The bobbin screws will hold them tight between baseplate and bobbin. . . unless you're not making them like a real P90.

Normally, you would put the magnets South to South.

[NightWinder]

ohhh, well......I stand corrected. My,my daddy!! Lets see, would you glue them in place at higher ohms? Say 12k, or maybe 17k. I always glue mine, but I cater to metal heads with stacks near spinal tap levels!!

[markeymark]

Thanks everyone!

I'm going to wind my first p90 today. (crosses fingers.)

[OFM]

Thanks everyone!

I'm going to wind my first p90 today. (crosses fingers.)

Good luck!

[David Schwab]

You have assumed that both magnets are of equal gauss. They will not be.

Why wouldn't they be?