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air gap amplitude anode anode current anode voltage applied band bias biased capacitance carrier cathode cell charge coil cold-cathode collector component conduction conductor connected considered constant core crystal current flowing curve cycle deflection Dekatron devices diode direction discharge effect electrical electrolyte electrons emission emitter employed energy equation germanium grid leak half-cycle increase induced e.m.f. inductance input signal input voltage ionization junction transistor load resistance magnetic amplifier magnetic circuit magnetic field magnetic flux metal meter modulation N-P-N transistor N-type negative feedback normally number of turns operation oscillator output voltage P-N junction P-N-P transistor parallel peak pentode pentode valve point-contact point-contact transistor positive potential difference potentiometer primary produce pulse reactance rectifier resistor resonant screen secondary semiconductor shown in Figure shunt sine wave stabilizer stage supply voltage switching synchronizing temperature thermionic thermionic valves transformer trigger triode tube tuned circuit typical variation vector voltage volts waveform winding zero