From top to bottom:- 10 band equalizer, very rare Brenell Mk 610 deck, this is the very rare version of the 610 with parabolic tape path. This is a mechanical deck and is four head. It records and plays back two track, but will also play back a four track tape with the fourth head. The deck is shown with the associated Brenell transistorized tape link. The next units are a pair of single channel Dolby A encode/decode units. Below the Dolby A units is a restored Revox A77 Mk1 two track high speed.