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10-volt output 50 ohms acoustic amperes AMPS audio voltage audio waveform bias voltage capacitance capacitor capacitor-input filter cathode follower cathode resistor cause oscillation choke component current feedback curve damping effect electric field Electromagnetic Shielding fed back feed feedback factor FREQUENCY CYCLES frequency response gives this response groove ground heater high frequencies high-impedance increased induced input resistance internal resistance kind load connected load current loop gain loudspeaker low frequencies low-frequency low-impedance low-level circuit magnetic field means microphone milliamperes millivolts needed negative feedback Nyquist diagram ohms original output voltage peak pentode phase shift pickup plate current plate supply playback positive feedback power supply produce pulses PUSH-PULL STAGE quency ratio reactance recording rectifier reduced reproduction result reverberation SAWTOOTH WAVE screen current screen potential shield short-circuited shunt smoothing sound source resistance square wave Stereophonic tape tone control voice coil voltage drop voltage fluctuation volts volume control waveform wire