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This 2 valve radio dates from 1925/6. It used to belong to the late Mr R M Nightingale and was given to me by his daughter. Roy Nightingale worked at Cambridge Instruments for many years. Konrad Birkner has advised that valves DE2LF, DE8, and PM4 were not produced before 1925. Consequently the set cannot be 1924 as I originally suspected.
