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