Hi Eric,
I can't find anything to substantiate it as being of American origin, and manufacture was shared by four British outfits - Ekco, Marconi, Plessey and EMI. I think the Americans were using Hallicrafters and Collins at that time and for quite a few years after the war. Although I did the TR1154/5 servicing component of my Yatesbury course, by 1955 it was almost extinct in the RAF. I spent most of my time on an MU at RAF Stoke Heath, and when I arrived there, just two guys were responsible for that equipment. After a few weeks spent helping out stripping & reassembling rotary generators from the VHF xtal-controlled comms equipent, I and two other guys set up a line to service the Marconi Radio Compass, and all three of us stayed there until demob in May 1957. That was fun.
The R1155 was still much prized as a receiver by the amataurs and short wave listeners for years after the war, and they are still quite a few kicking around now, including one owned by a mate of mine here on Crete.
Maurice