Slate Virtual Tape Machine A guitar pickup is basically just like a dynamic mike coil. For many years, powerful microphones have been sent with the voice coil attached to the principal of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's situation is typically linked to the cable shield, that will be connected to the mike amplifier's ground (see Rane's site for more discussion).
By and big, powerful microphones are extremely calm units consequently of the mix of transformer isolation and healthy, flying indication lines all through, as well as protected, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are just a partial (though important!) solution. The most obvious solution is to move your guitar collection to a healthy production, being a microphone. The same thought was printed this 2001 patent software such as Slate Virtual Tape Machine?