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a-c input a-v-c bias amplitude applied audio amplifier audio frequencies audio signal band battery beam capacitance carrier carrier wave cathode cavity resonator coil collector connected control grid coupling current flows d-c voltage detector diagram diode direct current direction electric electrons emitter energy feedback filament filter frequency modulation gain grid-leak bias half cycle harmonic impedance indicator inductance input signal intermediate frequency LC circuit load loudspeaker magnetic field maximum meter modulation negative ohms operation oscillator output voltage pentode plate circuit plate current plate voltage plate-load positive power amplifier power supply produce pulse push-pull quency r-f amplifier r-f signal radar radiation radio range receiver rectifier resistance resistor resonant frequency screen screen-grid shown in Fig signal voltage stage station superheterodyne receiver switch thyratron transformer transistor transmitter triode tuned circuit vacuum tube varies vertical voltage drop volts volume control wave wire zero