mixed in the mixer stage 1 this state is not different substantially from that in the case of fig1 a dc voltage is applied to the terminal 10 shown in the drawing and a bias suitable for this reception is applied to the gate g1 of the mixer stage 1 through the circuit of the resistor 24 the diode 16 the coil 2 and the resistor 22 under this condition the coil 2 is grounded with respect to high frequencies through the capacitor 17 to thereby operate as a peaking coil similarly to the case of fig1 because the diode 16 is in its on state while the diodes 14 and 15 are in their off state in this case a dc voltage is applied to the terminal 12 shown in the drawing and a proper bias is applied to the gate g1 of the mixer stage 1 through the circuit of the resistor 27 the diode 14 the coil 2 and the resistor 22 at this time the diode 14 is in its on state while the diodes 15 and 16 are in their off state and therefore the intermediate frequency from the uhf intermediate frequency tuning circuit 4 5 6 7 8 is supplied to the gate g1 of the mixer stage 1 which operates as a uhf intermediate frequency amplifier that is similarly to the case of fig1 a uhf input signal is coupled to the uhf mixer 9 through a not shown arrangement this uhf input signal is mixed in the mixer.