Abstract: A base drive inhibit circuit for positive and negative phase transistors of a switching amplifier. The circuit comprises a pair of comparators for comparing the voltage between the collector and emitter elements of the transistors with an appropriate reference voltage, and provides a signal to supply base drive voltage, when their associated output transistor is in a forward biased state and the level of reference voltage is less than the level of voltage between the collector and emitter. A logic control circuit supplies base drive voltage to one of the transistors when both a drive signal from an external source is in a proper polarity state and the output signal from the comparator indicates that the transistor is in a forward biased state.A timer is provided to delay base drive voltage to either transistor when the base drive signal is in a transition between polarity states.