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