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This letter reports on the operation of a repetitively pulsed relativistic klystron amplifier at 200 pps. The electron beam was reproducibly modulated to ≳60%. Using a 5 kA, 500 kV electron beam and a 500 kW magnetron as inputs, we extracted 3.3 kW average power in 80 ns FWHM pulses of 250–300 MW peak power at 1.3 GHz. Limitations that are directly attributable to the repetitive pulsing at these levels have not been observed. © 1994 American Institute of Physics.