Watch the The Hendrix online guitar lesson by Robbie Calvo from 50 R&B Licks You MUST Know
This lick is completely derived from the C minor pentatonic scale shape at the 8th fret. It could be described best as a series of descending 16th note triplets in bar 1, culminating in a couple of 8th note phrases to end.
Watch your timing on this one and try to make the triplet hammer on, pull off phrases smooth dynamically. You'll notice that I resolve to the Bb. This is the b7 of the C7 chord - very nice!