{HEAD ~ Bias} for transistor 168 is provided by {TAIL ~ current} via return resistor 174 coupled between the base thereof and the voltage source A 
{ HEAD ~ Bias } for transistor 168 is provided by { TAIL ~ current } via return resistor 174 coupled between the base thereof and the voltage source A
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH