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Class AB

An amplifier operating with the grid bias adjusted so plate current flows for greater than 180 degrees, but less than 360 degrees of the input waveform, by biassing the tube above cutoff, but below the point required for class A operation. The distortion is higher at low signal levels than true class A, but the efficiency is higher, although not as high as class B, allowing more output power than class A for a given plate dissipation.

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