Characteristics of a vacuum tube operating as a class B amplifier:
Low plate circuit efficiency, about 25%; practically no grid driving power; plate current flowing for 360 degrees of each cycle; practically no distortion of the output waveshape
Plate circuit efficiency, about 50-60%; plate current flows slightly more than 180 degrees of each cycle, medium power output
High efficiency, up to 80%; plate current drawn in bursts; great distortion of output waveshape
None of the above
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