Best Clean Tube Amp A guitar pickup is essentially similar to a powerful mike coil. For many years, vibrant microphones have already been wired with the voice coil attached to the primary of the microphone's transformer, and not introduced to surface (‘floating'). The microphone's event is typically attached to the cable shield, that will be linked to the mike amplifier's floor (see Rane's site for more discussion).
By and big, powerful microphones are extremely calm units as a result of the combination of transformer isolation and healthy, suspended indication lines throughout, in addition to guarded, humbucking coils.
So why don't you instruments? Instruments are once plagued by noise. Humbucking pickups are only a partial (though crucial!) solution. Well-known option is to float practicing the guitar pickup to a balanced result, being a microphone. A similar strategy was published this 2001 patent application like this Best Clean Tube Amp?