Help me to repair my Guitar

Discussion in 'Guitar' started by alstonfered, Feb 1, 2010.

  1. alstonfered

    alstonfered New Member

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    Why would a guitar amplifier emit a loud humming sound whenever you touch your thumb to the tip of the phone plug?
  2. openthink

    openthink New Member

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    This happens because of the very small signal from the guitar pickup one will need a high gain preamplifier to boost the signal to drive to main amplifier, if you touch the tip of the phone plug you are actually feeding a 50Hz or 60Hz signal that is picket up by your body that act as an antenna for the magnetic fields from the 50 or 60Hz mains, that is then amplified by the preamp to a large enough signal to drive the main amp. Single coil pickups are going to be real bad about this. Humbuckers where created in essence to address this issue and a good set of humbuckers shouldn't be bad about it at all.

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