Each diode 162, 164 and 166 conducts in the forward direction and thereby establishes {TAIL ~ a clipping level} at approximately +0.5 volts change in gate swing to emulate distortion associated with {HEAD ~ grid conduction} in a tube amplifier 
Each diode 162 , 164 and 166 conducts in the forward direction and thereby establishes { TAIL ~ a clipping level } at approximately +0.5 volts change in gate swing to emulate distortion associated with { HEAD ~ grid conduction } in a tube amplifier
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH