Current from this current source is applied to {HEAD ~ load resistor} 176 coupled between the collector of transistor 168 and {TAIL ~ ground} 
Current from this current source is applied to { HEAD ~ load resistor } 176 coupled between the collector of transistor 168 and { TAIL ~ ground }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL