I thought it looked like a Teac / Tascam.
Judging by the big meters, I was going to guess Studiomaster.
I started off about the same time, but with a Yamaha PM-430 (8 channels) instead of the 700. I don't think either one had inserts on the channels (or the mains!).
I have no clue about that thing between the two Ashlys in the rack. Maybe a crossover? That looks like a Dual cassette recorder sitting on top of the rack though.