Does an adjustable bridge need to be parallel to the frets?

1. How do you use the adjustable bridge on a guitar?
2. What is an adjustable bridge?

How do you use the adjustable bridge on a guitar?

Here are the steps the adjusting the action on a Gibson or Tune-o-matic bridge.

1. Tune your guitar to pitch.
2. Check the back-bow and relief of the neck.
3. Adjust the truss rod to straighten the neck.
4. Retune your guitar and check the back-bow and relief again.
5. Check and adjust the action at the nut.

What is an adjustable bridge?

An adjustable bridge on an electric guitar is exactly the same, but is adjustable so that it is easier to adjust the intonation settings when strings are changed or a heavier/lighter string gauge is used on the guitar.