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