{HEAD ~ The signal} at the collector of transistor 168 is then applied to {TAIL ~ the base} of a current drive NPN transistor 186 via a diode 178 
is applied to
{ HEAD ~ The signal } at the collector of transistor 168 is then applied to { TAIL ~ the base } of a current drive NPN transistor 186 via a diode 178
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH