While rummaging through some old photos on a hard drive I came across a bunch of photos taken at CFS Alert in 1958. These are RCCS personnel. The three receivers are a Collins R-388A, Hammarlund SP600 and RCA AR88. the Collins and Hammarlund were fairly new at the time the photo was taken having been manufactured in early 1950s. The RCA was made in early 1940s but still a decent receiver.
The repairman appears to be a well trained Forces tradesman.