JLS meant that the string might be binding in the nut slot.
It sticks in there as the tension is increased and then suddenly jumps
up in pitch when it breaks free.
Is the new string larger diameter? That might be the cause.
If that's not the problem:
Are the tuner gears exposed? Just bring the string up to pitch while
watching the back of the tuner. If it slips a tooth, you should see it
happen. If not exposed, you should also be able to see the post slip
if you watch it closely.
Also, as you are tuning upward, if the pitch doesn't seem to change,
and then suddenly goes up in pitch, then the problem is binding
in the nut slot.
If, as you are tuning upward, the string suddenly goes down in pitch,
the problem is in the tuner or the string end is not secured well to
the tuning post.
Last edited by megafiddle : 08-09-2013 at 09:37 PM.