This cannot be permitted since it is necessary to apply {TAIL ~ a voltage} of {HEAD ~ opposite polarity} to the transformer T1 to achieve demagnetization 
This can not be permitted since it is necessary to apply { TAIL ~ a voltage } of { HEAD ~ opposite polarity } to the transformer T1 to achieve demagnetization
OTH OTH OTH OTH OTH 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