so i bought this guitar brand new in 1999. about two years ago i noticed that when i play the 12th fret on the G-string, it decays REALLY fast, like if something would be dampening it. actually, all strings seems to suffer from fairly poor sustain, especially on the unwounded strings. this effect is especially dramatic with the 12th fret on the G-string, as said before.
here's a clip so you can get a better idea of the problem:
first two notes is the 12th fret on the 3rd string (E, the dead note)
third comes the 12th fret on the 4th string (B)
fourth comes the same note (B) on the 3rd string, 7th fret
the guitar is tuned to drop B, btw. i usually tune to D-standard, but the tuning doesn't seem to affect this issue anyway.
here's what i've tried so far (without success):
- different tunings
- different string gauges as well as wounded 3rd
- readjusting saddles
- ajusting action & neck bow
- tremolno and original spring holder
- locked unlocked trem and/or nut
- removing the neck and mounting it back ensuring good contact
- different pickups and pickup heigth
here's an old pic of the guitar when it still had duncans in it:
It you've tried different tunings and the dead note doesn't travel with it, its most likely some kind of fretwork issue. A dead note will go away if you use a different tuning where the new tuning is a far enough interval away from the original note.