There was also a sub-miniature version with wire ends ( Mullard DM70 / DM71, Mazda 1M1 / 1M3, GEC / Marconi Y25 ) intended for battery operation, used in one Ever Ready AM / FM battery receiver with push-pull output, as well as a small number of AM / FM mains receivers, which lit the valve from the 6.3V heater supply via a 220-ohm resistor or from the audio output valve's cathode bias.
मोबाइल