1922 Hartley Receiver Circuit
1925 Cockaday Four Circuit Tuner
1923 Reinartz
Miniature 1 valve Set
By using an unshielded Reinartz coil and one section of a midget 2 gang condenser, very small overall size can be achieved. The valve socket is of the button type, and reaction is controlled by a 20,000ohm carbon potentiometer. Filament supply can be from a single 1.5 volt battery, with a 45 volt "B" supply made up from linking 9 volt cells together
