The Music Master STD 5B was manufactured by Melhuish Radio Co. in about 1963.
Valves (4 or 5?): 6AQ5 output?
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version) This was probably quite a late 4 or 5 (or 4 with solid state rectifier?) model in the valve era. Serial number suggests 1963 which seems a little late.