In using the transformer to couple a filter circuit to a load it may be preferable to arrange the resistance of the third winding to be such that it forms a substantial majority of {HEAD ~ the load} on {TAIL ~ 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 
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In using the transformer to couple a filter circuit to a load it may be preferable to arrange the resistance of the third winding to be such that it forms a substantial majority of { HEAD ~ the load } on { TAIL ~ 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
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