{HEAD ~ Each diode} 162, 164 and 166 has {TAIL ~ its cathode} coupled to ground and its anode coupled to a node between the divider resistors 144/146, 150/152 and 156/158 of each stage 
has
{ HEAD ~ Each diode } 162 , 164 and 166 has { TAIL ~ its cathode } coupled to ground and its anode coupled to a node between the divider resistors 144/146 , 150/152 and 156/158 of each stage
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH 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 OTH OTH