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