Section 57B. The deputy court administrator for the juvenile court department as provided for under section 1 of chapter 211B shall, subject to the superintendence authority of the supreme judicial court as provided in section 3 of chapter 211, have the powers, authority and responsibilities set forth in section 10 of chapter 211B; provided, however, that the clerk of such court shall have responsibility for the internal administration of his office, including personnel, staff services and record keeping.