FOR YEARS, a goal of the designer has been to increase the frequency response of vacuum-tube amplifiers. Considerable success has been achieved, with the design of the video amplifiers, in obtaining a frequency response from 30 or 40 cycles up to 4 or 5 megacycles. This is adequate for present-day television video requirements, but amplifiers with greater bandwidth are needed for many applications, such as video amplifiers for improved television, wide-band telephone repeaters, and oscilloscope amplifiers.
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A. P. Copson (1950) studied this question.
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