The emitters of {TAIL ~ transistors Q5} and {HEAD ~ Q6} are coupled to the emitter series feedback resistors R1 and R2, respectively 
The emitters of { TAIL ~ transistors Q5 } and { HEAD ~ Q6 } are coupled to the emitter series feedback resistors R1 and R2 , respectively
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH