5 string p bass pickup

[Marko Ursin]

The 9500, & 10,000 turns, should be per bobbin.
T

That's right.

[David Schwab]

What type of magnets are you planning to use?
Relative permeability of neodymium magnets is near 1.
A cursory Google search on alnico shows a range of values of about 1.3 thru 6.7, depending on type, conditions, and who you ask.

I wouldn't use neo rods though. Too much string pull. Alnico is bad enough.

[rjb]

I wouldn't use neo rods though. Too much string pull. Alnico is bad enough.

I guess I didn't clearly make my point.
Please reference posts 4, 5, & 6

Post 4:
David King says the unmagnetized dummy slugs should have the same permeability as the magnetized poles- but he mis-remembers that AlNiCo has permeability close to air (i.e. relative permeability close to 1).

Post 5:
So Marko concludes that he should use plastic slugs.

Post 6:
I clumsily point out that neodymium has a relative permeability of 1, and AlNiCo has some higher permeability.

I didn't follow through and state what I thought was the obvious conclusion:
1) Since you are probably using AlNiCo magnetic poles, then use unmagnetized AlNiCo slugs.
2) If, for some reason, you are using neodymium poles, then use plastic slugs.

But yes, I would expect neo rods to be too strong for bass pickups.

EDIT:
This is all water under the bridge.
Marko has already built his 5-string P & split-J set, and they sound great.