This is a final report on the development of an electron tube designated as a Low-Noise, SHF Band, and Traveling-Wave Tube. The electrical specifications included a noise figure less than 13 db and a gain greater than 18 db with less than 5 db variation over the frequency band of 7.5 kmc to 11.3 kmc.nThe tube developed used a helix for the slow-wave circuit, cavity couplers, coupled helix attenuators, and a three region gun for noise reduction. A program was outlined for the construction of as many of these tubes as possible, each with a modification so as to empirically determine the best design for a broadband low noise tube. By proper de¬sign it was possible to obtain tube noise fig Jess as low as 8.4 db and less than 10.6 db over the band.
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