An operational treatment of the design of electromagnetic time-base amplifiers

The operation of electromagnetic time-base amplifiers is analysed and simple expressions are deduced from which their performance is readily predictable. The results thus obtained are discussed and the steps to be taken for the avoidance of undue distortion of the signal wave-form are indicated. The variations in anode potential of the amplifier valve are calculated; in particular, the maximum values of anode potential excursion are found, from which the H. T. supply voltage and the degree of insulation needed may be deduced. It is shown that much of the information required for the design of this type of amplifier may be obtained by consideration of the expression for the indicial transfer admittance. Finally, it is pointed out that the results obtained may be applied to a modified form of amplifier by means of slight changes in notation.