I'm experimenting with some new p90 pickup building approaches and wonder what the relationship is between strength of magnet, number of windings and wire gauge. Example: using 43 gauge wire, I wrap the bobbin x-number of times and get a reading of 8.5k. But until I drop the magnet in, the volume of that pickup is very low because the wire itself generates very little flux. Yet, when I DO drop the magnet in, even though the pickup is much louder the output remains 8.5k. We are accustomed to equating output reading with "strength" yet obviously the mag field is critical, not just in terms of tone but perceived volume. Is output a useful measure only within a class of pickup? In other words, an output of 9.2k for, say, an alnico v humbucker only has comparative value to another alnico v humbucker, not with a p-90 or a tele single coil, etc?