Ever Ready K80B

Directly heated 2-volt battery octode frequency changer

K80B

Electron coupled frequency changer for battery all-wave superhet receivers. Equivalent (exactly - this is a Mullard valve) to the FC2A this valve is designed for use up to 19 megacycles (16 metres). The filament and grids 1 and two form a triode oscillator, grid 3 is a screen, grids 4, 5 and 6 with the anode form a vari-mu pentode mixer. Maximum anode voltage 135, filament current 120 mA at 2 volts. British 7-pin base.