5. IN A FULL WAVE, PUSH-PULL SELF-SATURATING MAGNETIC AMPLIFIER HAVING AT LEAST FOUR CORE SECTIONS WITH A FIRST TWO OF SAID SECTIONS FORMING ONE SIDE OF SAID AMPLIFIER AND A SECOND TWO OF SAID SECTIONS FORMING THE OTHER SIDE OF SAID AMPLIFIER; A BIASING ARRANGEMENT COMPRISING BIAS WINDINGS COUPLED TO EACH OF SAID CORES TO PERMIT RESETTING THEREOF, MEANS CONNECTING THE BIAS WINDINGS OF SAID FIRST TWO CORE SECTIONS IN SERIES WITH EACH OTHER TO FORM A FIRST SERIES CONNECTED SET OF WINDINGS, A CONTROL CIRCUIT COUPLED TO SAID AMPLIFIER SECTIONS TO ALLOW DIFFERENTIAL RESET OF PAIRS OF SAID SECTIONS, MEANS CONNECTING THE BIAS WINDINGS OF SAID SECOND TWO CORE SECTIONS IN SERIES WITH EACH OTHER TO FORM A SECOND SERIES CONNECTED SET OF WINDINGS, AND MEANS CONNECTING SAID FIRST AND SECOND SERIES CONNECTED SETS OF BIAS WINDINGS IN PARALLEL WITH EACH OTHER, WHEREBY ENERGY MAY BE COUPLED BETWEEN SAID CORES THROUGH SAID BIAS WINDINGS TO PRODUCE A DIFFERENTIAL RESET BETWEEN THE CORES ON THE TWO SIDES OF SAID AMPLIFIER WHILE SUCH CORES ARE PASSING THROUGH THEIR RESET INTERVAL, SAID BIAS WINDINGS BEING COUPLED IN A DIRECTION SUCH THAT THE DIFFERENTIAL RESET PRODUCED THEREBY IS IN THE SAME DIRECTION AS AN INPUT SIGNAL APPLIED TO SAID CONTROL CIRCUIT.