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