52 pages matching audio signal in this book
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Vacuum tube radios
Vacuum tubeshow they work
12 other sections not shown
ac/dc alignment anode antenna audio amplifier audio output audio signal bias capacitance car radios cathode circuit symbols components connected control grid coupled crystal set current flows dc power supply detector circuit dielectric digit diode earphones electrolytic capacitor electromagnet electrons emission equipment feedback Figure filament filter capacitor ground half-cycle impedance inductance inductor input signal load loudspeaker magnetic field mixer modulation negative ohmmeter ohms operation oscillator oscilloscope output transformer pentode plate current plate voltage positive potentiometer power amplifier preamplifier probe problem produce radio receivers reactance replaced resistance resistor resonant frequency RF amplifier RF signal ripple filter screen grid secondary winding shown in Fig shows signal level sinewave solid-state speaker stage stations superhet superheterodyne terminal transistor transmitters TRF radio trimmer triode troubleshooting tuned circuit vacuum tube variable capacitor vector voice coil voltage volts volume control waveform wire WVdc zero