Originally Posted by
McCreed
That would be my first suspicion. The source of string buzz can be an elusive thing sometimes. Lots of weird things can happen.
For example a problem at the nut can sound like it's coming from the bridge (unwound G strings are notorious for this) and what happens above the nut is as important as what happens below the nut when it comes to string vibration.
Without seeing the whole guitar, my inclination is that the string slot in the nut or the entire nut could be too low. However it could just be the angle or depth which the low E slot is cut.
What is the string action at the first fret on the low E when depressed at the third fret?
If the depressed string is touching the first fret, the action is too low(ie: slot or nut too low).
It would be a good idea to check each of the strings in the manner while you're at it. FWIW, I set the nut action at .008" E/A; .006" D/G;.004" B/E. These are just a guide - each guitar may vary depending other factors. (a holistic approach)
Did you cut the nut, or are the slots just as they came?