HB bobins balance

[Corcia]

i've read that often the two bobins of HBs are wound at dufferent number of coils, could someone explain the reason behind? and how can be pushed such difference?

[Marco78]

i've read that often the two bobins of HBs are wound at dufferent number of coils, could someone explain the reason behind? and how can be pushed such difference?

To give more "single coil" features to humbucker pickups, like old PAF.