Evh Wolfgang Standard A electric guitar pickup is basically just like a powerful mike coil. For many years, powerful microphones have been wired with the voice coil attached to the primary of the microphone's transformer, and not referenced to surface (‘floating'). The microphone's case is usually linked to the wire guard, which can be connected to the microphone amplifier's floor (see Rane's website for more discussion).
By and big, vibrant microphones are very calm products as a result of the mix of transformer solitude and balanced, hanging sign lines all through, in addition to guarded, humbucking coils.
Therefore why not guitars? Instruments are notoriously overwhelmed by noise. Humbucking pickups are just a partial (though essential!) solution. The obvious option is always to float the guitar pickup to a balanced output, as being a microphone. A similar strategy was printed this 2001 patent request such as Evh Wolfgang Standard?