Transistors Q5 and Q5A form a phase splitter circuit which controls {HEAD ~ switching} of the drain line transistors Q9, Q10, Q9A and {TAIL ~ Q10A} to establish the push pull operation of the driver as is well understood in the art and need not be further discussed herein 
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Transistors Q5 and Q5A form a phase splitter circuit which controls { HEAD ~ switching } of the drain line transistors Q9 , Q10 , Q9A and { TAIL ~ Q10A } to establish the push pull operation of the driver as is well understood in the art and need not be further discussed herein
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