Guitar intonation problem, any genious can help me out?

[Utopia]

Hey guys. I have a weird issue with my electric guitar intonation. The B string is perfectly in tune on every fret except when played open it's too flat. If I put the open B in tune, all fretted notes are too sharp. Here's the weird part. The sharpness doesn't increase when going up the neck. So I guess the problem is not in the saddle position. (Plus it won't go any further from the neck, damn you tune-o-matic) I wonder if the string slots are not deep enough? But I don't want to ruin my guitar before asking the professionals here. Can anybody help me? Thanks!

[Rudi]

Hi Utopia.

 

I haven't come across this before but it sounds as if the problem is at the nut. Probably that the string slot is slopped causing the string to be supported at the wrong end of it. So yes, possibly the nut slot is too shallow at the fretboard side and vibrating within the slot.

 

If thats right, you may be able to see it. Maybe use a magnifying glass in good light.

If it were my problem I would use a spec of superglue in the slot and refile it when dry. Just ensure you file the slot parallel or maybe even slightly slopped the other way.

[Utopia]

I'll try this and see if it works. Thank you!