The output winding is coupled to {TAIL ~ a transformer} having {HEAD ~ a primary}, a secondary and at least one closed tertiary winding 
The output winding is coupled to { TAIL ~ a transformer } having { HEAD ~ a primary } , a secondary and at least one closed tertiary winding
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH