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alternating current amplifier amplitude assumed atom audio frequencies capacitance cathode Chap characteristic curves coefficients coil component condenser conductance connected constant coupling curves of Fig cycles per second denoted detection detector diagram diode effect electrical electron affinity electrons emitter Equation equivalent expressed filament frequency given by Eq gives grid and plate grid circuit grid current grid voltage heating hence impedance increase inductance ionization maximum measured metal method modulation negative obtained ohms oscillation oscillatory circuit output oxide oxide-coated path of operation pentode Phys plate and grid plate circuit plate current plate load plate voltage plate-current plotted positive ions quantity reactance reduced regeneration resistance secondary circuit secondary emission shown in Fig sinusoidal space charge space current strontium tantalum temperature tetrode thermionic thermionic emission thorium transconductance triode tungsten vacuum tube variation varies velocity voltage amplification voltage ratio voltmeter volts wire zero