We have recently begun hot-testing of a number of high power coaxial gyroklystron tubes, which are being evaluated as potential drivers for future linear colliders. In a 3 cavity first-harmonic tube, we have produced over 75 MW of peak power in a 1.7 microsecond pulse with an efficiency near 32percent and a gain near 30 dB. In this paper we will detail the results of this tube and the results for a second harmonic tube which is currently being installed on our test bed.
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