| Summary: | The possibility of using a wire-wound cryotron as an amplifier is examined and it is shown that current and voltage gains greater than unity are possible. Advantages of a superconducting ground plane are investigated and it is subsequently used in all experimental work.The frequency response of the deviee is determined by the time constants of the control circuit and load impedance,resulting in an upper frequency limit of approximately 10 Ke/s. Barkhausen noise is the dominant noise, due to diseontinuous movements of superconducting and normal domain in the intermediate state of the gate. The difficulty of nucleating superconducting domains in a resistive surrounding is believed responsible for hysteresis when the dominant magnetic field is the self-field of the gate.Under certain experimental conditions fluctuations of the gate resistance aye observed, and are shown to be due to thermal instabilities.
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