Tommy Bolin Deep Purple A electric guitar collection is essentially much like a powerful mike coil. For decades, dynamic microphones have now been sent with the voice coil attached to the primary of the microphone's transformer, and perhaps not referenced to soil (‘floating'). The microphone's situation is usually linked to the wire guard, which can be linked to the microphone amplifier's ground (see Rane's website for more discussion).
By and large, energetic microphones are extremely quiet units as a result of the mix of transformer isolation and healthy, suspended transmission lines throughout, in addition to protected, humbucking coils.
Therefore why don't you guitars? Instruments are once affected by noise. Humbucking pickups are only a partial (though essential!) solution. The obvious option is to float the guitar pickup to a healthy output, being a microphone. A similar idea was printed this 2001 patent request such as Tommy Bolin Deep Purple?