In using the transformer to couple a filter circuit to {HEAD ~ a load} it may be preferable to arrange the resistance of the third winding to be such that it forms {TAIL ~ a substantial majority} of the load on the filter whereby even extreme changes in the impedance of the external load on the filter cause only small changes in the total terminating impedance presented to the filter 
In using the transformer to couple a filter circuit to { HEAD ~ a load } it may be preferable to arrange the resistance of the third winding to be such that it forms { TAIL ~ a substantial majority } of the load on the filter whereby even extreme changes in the impedance of the external load on the filter cause only small changes in the total terminating impedance presented to the filter
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL 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 OTH OTH OTH OTH OTH OTH OTH