Abstract: A supply unit for a tube of the type requiring both a cathode supply and a collector supply, notably for a travelling wave tube. The tube features a collector biasing device, working essentially as a voltage source, delivering a weakly regulated or unregulated and weakly filtered or unfiltered voltage between the collector and the cathode, and having one of its terminals connected to the cathode and the other terminal connected to the collector. Also, a cathode biasing device is featured for delivering a highly regulated and highly filtered voltage to the cathode so as to keep the potential of the cathode constant at its chosen point of operation. A charge storage capacitor, one armature of which is connected to the cathode and the other to ground, is also included.

Abstract: In a voltage-switching device for such applications as the control of electron tube grids in the field of radar or telecommunications, the total voltages to be switched are distributed at the terminals of a series-connected array of MOS field-effect transistors, thereby ensuring that each individual transistor is not liable to carry voltages in excess of such values which could result in transistor damage or destruction.