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alternating current amplifier amplitude assumed atom audio frequencies balance cathode Chap characteristic curves characteristic surface coefficients coil component condenser conductance connected constant curves of Fig denoted detection detector diagram diode distortion electrical electrons emission emitter equal Equation equivalent expressed filament frequency given by Eq gives grid and plate grid circuit grid current grid potential grid voltage hence impedance impressed increase inductance input admittance ionization maximum measured metal method modulation mutual inductance negative obtained ohms oscillation oscillatory circuit path of operation pentode Phys plate circuit plate current plate load plate voltage plate-current plotted positive ions radio-frequency reactance reduced regeneration resonance secondary circuit secondary emission shown in Fig sinusoidal space charge space current temperature tetrode theorem thorium transconductance triode tube capacitances tuned tungsten vacuum tube variation varied velocity voltage amplification voltage ratio voltmeter volts zero