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The experimental results of a zero-drive stable, short pulse 140 GHz gyro-traveling wave tube amplifier are presented. The amplifier has achieved a linear gain of 34dB, a saturated bandwidth of over 1.5GHz, and a peak output power up to 800W at a beam voltage of 37kV, beam current of 2.9A, and beam pitch factor of 0.7. The gyro-TWT operates in the HE(0,6) mode of a quasi-optical confocal waveguide.