Quote:
Originally Posted by Tony Reid
Has anyone noticed that the intonation above the 12th fret goes out more noticeably after the neck has been shimmed? Or do I just need to fiddle around with the bridge saddles to get it back to an acceptable level?
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Yes, that happens more often than not, and you fix it by adjusting the intonation screws holding the bridge saddles.
If the guitar goes flat on the upper frets (as in above 12:th or so), the distance between the bridge and the saddle should be shortened and vice versa.
Make sure the guitar is in tune when you do it. Then loosen the string you are about to adjust a little. Adjust, tune it and check again.
The note you get when you play 12:th fret should be the same as when you play it open. I also like to check it furter up. Take first string as an example. I tune it to E, I check at 12:th fret so that is an E as well, then at 17:th so that it is an A and 19:th is a B.
One reason to do this is that sometimes, not very seldom, one fret can be slightly out of whack for one reason or another. If that fret is the 12:th and you just check at 12:th you will have a guitar that is in tune at 12:th fret but not at 9:th, 10:th, 11;th, 13;th, 17;th and so forth. It has happened to me.