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This paper describes the design, construction, and performance of a time base generator for use with a cathode ray tube capable of displaying fractional nanosecond transients. The generator was designed for use with a traveling wave cathode ray tube having a simple electrostatic time base deflection structure. When operating into the deflection plates (total capacitive load of 25 pF), the generator produced a total ramp excursion of -4 kV with a maximum average slope of about -450 V/ns. with a maximum repetition rate of 10 kHz. The ramp slope may be decreased continuously by a control voltage. The generator may also be operated into a 50 ohm load for the production of a -750 V transition with a 10%-90% transition time of 4.8 ns.