The relative winding polarities of {HEAD ~ the upper primary winding L2}, lower primary winding L1 and {TAIL ~ secondary winding Ls} are indicated in a conventional manner by the dots  
The relative winding polarities of { HEAD ~ the upper primary winding L2 } , lower primary winding L1 and { TAIL ~ secondary winding Ls } are indicated in a conventional manner by the dots
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH