Broadcaster, Service Man's Manual

Seems to have existed from 1936 until at least 1940, when it was published only twice per year.

Information by Mark Hippenstiel: Description of vol.4 1937:
56 pages, stapled into card covers, well illustrated throughout with B&W photographs and line drawings. A pre-war publication for servicemen, packed with articles and features full of practical and technical information on the repair commercial radio recievers. Covers a wide range of equipment, including wirelesses and radiograms from Aerodyne to Ultra.