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