You mean during that time when Jack was continually chasing tone that he never really found during that time? That apogee?
His current sig model is based on his early 70s Les Paul bass , which had, wait for it...one pickup in the sweet spot.
Most successful J.A. albums and live performances were from 66 to 69 which was before H.T. and also, wait for it... before early 70's! I did not offend anybody with my posts, cannot understand why you have sarcastic attitude.
I just say that he is mostly known as the bassist of J.A. and you cannot argue that, neither you can argue that J.A. was not more successful than H.T. Chasing a tone, maybe, but always with a pup right next to the neck,
even with a jazz bass.