Polarity of neck and bridge pre cbs Jag pickups?

[FuzzMitch]

This is a question from another person on another forum which im not sure of the answer and has not been answered, at all, in a week. Which heads: "Polarity of neck and bridge pre cbs Jag pickups".
So if someone could pass the advise ild pass it on to this guy whos been left-in-the-lurch, thanks.
Quoting his question:
" I have installed a jag 63 staggered black bottom pickup into my 64 jag(to replace incorrect reissue pickups before),
(He's) searching for the second real vintage pickup to buy and place into the bridge position.
Is polariry really necessary to know? If polariry of bridge will be same as of my neck pick up, is it really a problem...? hum will be bigger or just the same as in single position? If the hum of both combined pickups (middle position) is the same as single position, I don´t see it as problem. I understand that there will be no cancellation hum effect but it shoud be still fine?
Simplified question: can i buy any jag pre cbs pickup and will it work with my actual neck pickup together?

 

[ZipZapOuch]

It depends. The coils are wound, there is no changing (rewinding) them. Installing two identical coils will simply add (double) any EMI hum so it is a concern, especially if you are adding a distortion pedal with gain. He'll have some hum but only about double of a similar single-wound coil (not a deal killer but it could be - depending on how hot the pickup is, presence of electrical noise in the area and gain of any distortion pedal attached.

If he finds the new pickup is identical to his existing segment, he can flip the magnets in one of the coils. The would have the same effect as rewinding the coil in the opposite direction - assuming the pickup's bobbin (body) allows access to the magnets.

 

[rjenkinsgb]

With only one pickup active, the phasing does not matter and the hum level should be no different.

The time the phasing would be noticeable is with both pickups active at the same time. In or out of phase will give a different sound.

The hum will depend on relative winding directions of the two two pickups; it could either add or cancel to some extent.

(Swapping the magnet polarity would reverse the audio phasing, but not the hum - that's down to coil winding direction alone).

If the guitar is not already fully screened, it would be worth lining the pickup & control cavities, and covering the rear of the pickguard, with self adhesive copper foil screening tape. Link that to ground, it reduce general noise pickup to some extent.
The proper stuff is supposed to have a conductive adhesive but I always add some small solder spots at various places on the overlaps to ensure good continuity.

 

[FuzzMitch]

It depends. The coils are wound, there is no changing (rewinding) them. Installing two identical coils will simply add (double) any EMI hum so it is a concern, especially if you are adding a distortion pedal with gain. He'll have some hum but only about double of a similar single-wound coil (not a deal killer but it could be - depending on how hot the pickup is, presence of electrical noise in the area and gain of any distortion pedal attached.

If he finds the new pickup is identical to his existing segment, he can flip the magnets in one of the coils. The would have the same effect as rewinding the coil in the opposite direction - assuming the pickup's bobbin (body) allows access to the

 

[FuzzMitch]

With only one pickup active, the phasing does not matter and the hum level should be no different.

The time the phasing would be noticeable is with both pickups active at the same time. In or out of phase will give a different sound.

The hum will depend on relative winding directions of the two two pickups; it could either add or cancel to some extent.

(Swapping the magnet polarity would reverse the audio phasing, but not the hum - that's down to coil winding direction alone).

If the guitar is not already fully screened, it would be worth lining the pickup & control cavities, and covering the rear of the pickguard, with self adhesive copper foil screening tape. Link that to ground, it reduce general noise pickup to some extent.
The proper stuff is supposed to have a conductive adhesive but I always add some small solder spots at various places on the overlaps to ensure good continuity.

With only one pickup active, the phasing does not matter and the hum level should be no different.

The time the phasing would be noticeable is with both pickups active at the same time. In or out of phase will give a different sound.

The hum will depend on relative winding directions of the two two pickups; it could either add or cancel to some extent.

(Swapping the magnet polarity would reverse the audio phasing, but not the hum - that's down to coil winding direction alone).

If the guitar is not already fully screened, it would be worth lining the pickup & control cavities, and covering the rear of the pickguard, with self adhesive copper foil screening tape. Link that to ground, it reduce general noise pickup to some extent.
The proper stuff is supposed to have a conductive adhesive but I always add some small solder spots at various places on the overlaps to ensure good continuity.

Thanks to both ZipZap' and Rejenk'. Thanks very much for that. Would you mind if i quote that back to him? and ill mention this 'electro-tech' site for him.