When {HEAD ~ the field} effect {TAIL ~ transistor T} becomes conductive again, the first capacitor C1 is effectively in parallel with the series circuit of the second diode D2 and the first coil L1 
effect
When { HEAD ~ the field } effect { TAIL ~ transistor T } becomes conductive again , the first capacitor C1 is effectively in parallel with the series circuit of the second diode D2 and the first coil L1
OTH 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 OTH OTH OTH OTH OTH OTH