Balance Control & Push-Pull or Push-Push Coil Tap
To create a specific tone, some instruments feature a balance control that determines the mix of pickup signals being sent to the amplifier. In the center (detented) position, both pickups send the same vol- ume. Turning the knob counterclockwise selects more bridge pickup signal, while turning it clockwise sends more neck pickup signal.
When engaged, this switch, usually located on a Volume Control or Tone Control, allows one coil from a dual pickup to be turned off, effectively cutting the output in half. Note that as the humbucker is now functioning as a single coil, it will exhibit more hum or noise.
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