Watch the Half Diminished Chords online guitar lesson by Fareed Haque from Jazz Rock Workshop
Remember F# half-diminished is same as Am6. Our three minor pentatonic scales again are built on 1, 5 and 9 of Am or Am pentatonic, Em pentatonic and Bm pentatonic. Check out adding the g# to any of the 3 scales. F# is the Major 9th of F# half-diminished and a very cool sound.