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