The model 518-M is a mantel model housed in an attractively designed moulded cabinet, which is produced in three colours—Ivory, Walnut and Burgundy. Features of its design include: Tropic-proof construction, automatic volume control, magnetite cores in I.F. transformers and broadcast oscillator coil, air-dielectric trimming capacitors. Electrically, this receiver closely resembles the model 510-M, differences being in the- addition of an ON/OFF power switch and slight circuit code alterations. (See* back for circuit diagram and code.) For all other information, refer to the 510-M Service Instruction Manual.