Re: Raising pole-pieces on P90 pickups- what to expect?
The main reason to move them around is to adjust the volumes of individual strings.
In general, plain strings are louder than wound strings, and thicker strings are louder than thinner strings. Plus you have the fact that strings are not set flat from 1st to 6th. All of these factors mean that flat poles result in a volume imbalance from string to string. Whether using non-staggered poles, or using poles that follow the string radius, there will be a string to string volume imbalance. Most people learn to play around it, and just accept it as part of the "sound" of that particular guitar. I myself find the imbalance troublesome in chords, especially due to excessive G (or 3rd) string volume.
As to what this translates to on the actual screws, first of all, it means the D pole will be the highest, and the G pole the lowest. The D pole is underneath the thinnest wound string, meaning that it is the quietest string on the guitar. Plus the D string is usually the farthest from the pickup (sometimes equal distance as the G string, but usually a bit higher than the G). The G pole is underneath the thickest plain string, meaning that it is the loudest string on the guitar. But it doesn't go quite as low as you'd think, because the G string is among the farthest strings from the pickup.
B and high E are "ramped" up from the G pole, each one a bit higher.
Same thing with A and E, but they are ramped down from the D string.
But you have to go back to the A and lower it once you have set that "ramp." For some reason, the A string is often louder than the E. I haven't ever found out why.
Note: When I say "louder" and "quieter" here, I'm speaking electronically, about the signal from the guitar – not acoustically, about the un-amplified strings.
In the end, when you achieve very close string to string volume balance, your pole stagger looks about like this:
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The heights of both E poles are usually around the same, and the heights of the A and B strings are usually around the same.
If you are using a wound G string (which very few people do these days on electric guitar), it's like this:
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Same as above, except the 3rd string pole becomes the highest one (because the 3rd string is the quietest string on the guitar when it is a wound string).