Echoplex Pre Amp A guitar collection is actually just like an energetic mike coil. For many years, active microphones have now been wired with the voice coil attached with the principal of the microphone's transformer, and not recommended to ground (‘floating'). The microphone's event is normally linked to the cable shield, that is connected to the mike amplifier's surface (see Rane's site for more discussion).
By and large, active microphones are very quiet devices as a result of the mix of transformer isolation and healthy, floating indication lines throughout, in addition to shielded, humbucking coils.
So why don't you guitars? Instruments are once plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. The most obvious solution would be to float your guitar collection to a balanced productivity, being a microphone. A similar strategy was published that 2001 patent program such as Echoplex Pre Amp?