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Recent years the development and manufacture of the broadband (the bandwidth up to 10%) and super broadband (the bandwidth more than 10%) klystrons have been highly regarded. On one-beam devices experiments were carried out in the 70s (Metivier, 1971), then there were realization theoretical research of one-beam and multi-beam version of the broadband klystrons (Artjuh et al., 1979; Kanavets, et al., 1978). The realization of multi-beam broadband klystron was shown at the bandwidth up to 10% (Kanavets, et al., 1978). The experimental research of broadband and super broadband multi-beam klystrons (MBK) is carried out now in Institute of Electronics, Chinese Academy of Sciences, and theoretical research together with the M.V. Lomonosov Moscow State University. The calculations used 1.5D code klystron-MSU and 2.5D code arsenal-MSU (Sandalov et al., 2002) of the super broadband klystron are presented below.