Tulac is right, old strings can cause the fretboard to be "out of tune", but it can also be an incorrect bended fretboard. This is fixable on most guitars, by turning the fretboard truss rod. It is a delicate operation that should be done by someone who knows exactly what he/she's doing.
EDIT: Another cause is that the adjustable blocks on the saddle are out of position. When in correct position, the 12th fret and 12th fret harmonic should produce the exact same tone.
2nd EDIT: Last, if the string gauge is changed, say from 0.09 to 0.11, that can also mess up the tuning. Basically, you want to tune the guitar to one gauge and stick with that.
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Je Suis Charlie
Last edited by Mighty Midget; 27-12-2007 at 04:34 PM.
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