Vacuum Tube Synchronizing Equipment

Potential front high-voltage circuits is obtained by means of capacitance transformers. This potential is applied to the grid circuit of vacuum-tube amplifiers, the output from which drives a rotating type of synchroscope. Thus the vacuum-tube synchronizing equipment makes unnecessary costly high-voltage transformers, which have been almost universally used for synchronizing in the past. The paper describes the commercial apparatus, gives equations pertaining to the vacuum-tube amplifier and shows calculated and measured characteristic curves.