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The large-signal traveling-wave amplifier equations have been solved and results are presented for a wide range of the traveling-wave amplifier parameters. The results have been analyzed and are presented to provide design information on large-signal traveling-wave amplifiers. Curves of saturation voltage gain and saturation efficiency are included for C= 0.05, 0.1, and 0.2 when QC= 0 and for QC= 0.05, 0.125, 0.25 and 0.50 when C= 0.1; for the space-charge cases B = 0.5, 0.75, 1.0 and 1.5. In all cases d = 0. A power output vs power input curve is shown for the case C = 0.1, QC = 0.25, B = 1 and d = 0. For all the cases studied the ratio of helix-to-stream radii was taken as 2. The effect of series loss along the helix is also studied for C= 0.1, QC= 0.125 and B= 1: curves for variable d at fixed b and for variable b at fixed d are presented. The effect of the placement of loss is also studied.