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