1. A BALANCED MAGNETIC AMPLIFIER COMPRISING A SATURABLE MAGNETIC CORE CARRYING A PLURALITY OF WINDINGS INCLUDING A CONTROL WINDING AND AT LEAST A FIRST AND SECOND GATE WINDING, A RECTIFIER AND OUTPUT RESISTOR CONNECTED IN SERIES WITH EACH OF THE GATE WINDINGS, CIRCUIT MEANS CONNECTING THE FIRST AND SECOND GATE WINDING SERIES CIRCUITS IN OUT OF PHASE RELATION TO A SOURCE OF VOLTAGE HAVING PERIODIC REVERSALS OF POLARITY AND NON-UNIFORM IN MAGNITUDE OVER EACH HALF CYCLE TO TEND TO CAUSE CURRENT FLOW THROUGH A DIFFERENT ONE OF THE SERIES CIRCUITS DURING ALTERNATE HALF CYCLES OF THE VOLTAGE SOURCE, BLOCKING VOLTAGE MEANS COUPLED TO EACH OF THE GATE WINDING SERIES CIRCUITS, SAID BLOCKING VOLTAGE MEANS PREVENTING CONDUCTION OF THE