. The thermionic vacuum tube and its applications . ph shows two sets of curves takenon the same film, /o represents the current in the oscillation cir-cuit and is 90° out of phase with the plate current I^. The gridcurrent Ig is in phase with the plate current and the grid potential,and these quantities are nearly 180° out of phase with the platepotential Ep. J. H. Morecroft ^ has computed the efficiency for a nimiber ofassumed shapes of the plate current wave. These curves areshown in Fig. 177. Below the figure are indicated the powerdissipated at the plate, the output power and the efficien
. The thermionic vacuum tube and its applications . ph shows two sets of curves takenon the same film, /o represents the current in the oscillation cir-cuit and is 90° out of phase with the plate current I^. The gridcurrent Ig is in phase with the plate current and the grid potential,and these quantities are nearly 180° out of phase with the platepotential Ep. J. H. Morecroft ^ has computed the efficiency for a nimiber ofassumed shapes of the plate current wave. These curves areshown in Fig. 177. Below the figure are indicated the powerdissipated at the plate, the output power and the efficiency foreach of the assumed shapes of the plate current waves. In thelast case, where the current wave is assumed to be rectangular,the efficiency rises to a value of 82 per cent. This represents thebest condition as far as output power and efficiency are con-cerned, but in general the output power decreases as the efficiencyincreases because this assumed shape of wave is not obtained in 1 Transactions of , 1919. 304 THERMIONIC VACUUM TUBE. Ig. Grid lo. Oscilla-tion Current Ip, Plate
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