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amplitude assumed bandwidth base current bias C₁ capacitance capacitor carrier cathode characteristic curves circuit of Fig collector current collector voltage common emitter component conduction configuration constant control grid current gain cutoff d-c load decreases density determined diode electrons emitter current energy equation equivalent circuit example feedback filter frequency frequency modulation given in Fig grid voltage increased input signal input voltage junction load line load resistance magnitude maximum milliamperes modulation index negative noise operating point oscillator output current output voltage p-n junction p-n-p transistor parameters pentode phase plate current plate voltage plot potential power supply PROB pulse R-C coupled R-C coupled amplifier R₁ R₂ ratio reactance rectifier region resistor root-locus saturation screen grid shown in Fig switching T₂ temperature thermal transfer function transistor amplifier transistor T₁ triode tuned amplifier tuned circuit tunnel diode V₁ vacuum tube voltage gain waveform zero