Quote:
Originally Posted by Schroeder
+100,000,000
Capo at the first fret, downtune a half step until you are tuned to concert pitch G while capoed, then check the open G with the 13th fret to see if it intonates. If your nut slot is not cut deep enough, the intonation will likely be off and the note at the 13th will play slightly flat (assuming intonation is ok when you compare open G to the fretted 12th fret G). My vote is that it will require deepening the nut slot.
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I'm no luthier, but, depending on the guitar, perhaps it would be better to test the intonation using the capo suggestion without tuning down 1/2 step. Instead, put the capo on, fine tune anything that is off, then test the intonation at the 13th. The way I see it, all things are equal for comparison - no neck shifts or bridge shifts will occur, which would throw the intonation off, anyway.