● The pre-regulator functions in a similar fashion to provide line and load regulation. The series pass stage,
    in addition to giving the CD Series its tight regulation characteristic , reacts rapidly to line and load
    changes to Produce a transient response characteristic similar to the linear series pass types.

● With a relatively constant voltage across the series pass stage more efficient use is made of series transistor
    capacity, and hence ,the pre-regulator approach yields a four or five-to one reduction in the number of series
    pass transistors.