It’s a tribute to how good the bands were when the blend is a mic pre and no other options. Folded horn cabinets setting on the stage with 2” horns and crown dc300 amps. (Or tube Macintosh) As well as the balance the engineer created.
The bands were definitely good, but the Sound Reinforcement in those gigs at those times was pretty horrendous!!
98% of the people were totally high on drugs so they had a great time anyway and didn't care they couldn't hear anything!
Point is, equipment for Live Sound in the 70s was so basic or non-existent, so far away from the developments in the studio world, that I don't believe that a Neve console was ever used for a Live gig during the 70s.