I have seen pictures of oddments of a replay only machine based on the TR50 deck. I would assume this would have been a single speed 7.5 ips machine.
Perhaps the cabinets were based on the HMV 3030 console recorder, apart from the TR50 deck it has a 13 x 8 speaker which sounds very good even on the 2 watt standard amplifier.
https://www.radiomuseum.org/images/r...30_1872973.jpg
(very poor image)
Just surmising that the 18 watt amplifier could have been similar to that used in the RE351, which was a mono reproducer based on a TR90.
Dr Dutton was high up in the research department at Hayes when my Dad was working at EMI in the early fifties.