is jimi using the B minor pentatonic scale through this great song? If not what scale? Thanks in advance.
He tunes down 1/2 step, so it is in fact Bb, but to keep things simple, I'll talk about it as if it were in standard.

The song is a B major blues, so it's not quite B minor. However, in a major blues, the minor pentatonic is often used, however odd that sounds. Additionally, Hendrix uses the B major pentatonic, the B blues scale, and most likely, the B mixolydian scale.

Blues can get complex real fast.