BS CP 1005:1962

This code is intended to give guidance to designers of equipment using electronic valves, so that optimum performance and life may be secured. It contains a section applicable to all electronic valves and separate sections giving additional recommendations specifically appropriate to different classes of valves, viz.: domestic receiving valves; cathode-ray tubes; rectifiers including grid controlled rectifiers (thyratrons); photocells; transmitting valves; cold cathode tubes; magnetrons; special quality valves.