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A tunable traveling-wave maser (TWM) for the frequency range 40-46.5 GHz has been developed, which is characterized by an extended instantaneous bandwidth. Andahssite (Al 2SiO 5 ) doped with Fe 3 atoms is used as the active crystal. The slow-wave structure is a digit comb with broad-band matching particularly suitable for the millimeter range. The new type of isolator employed is based on textured hexagonal ferrite materials, namely BaNi 2Sc xFe, 16- xO 27. The net gain within the tuning band is 20-35 dB. The instantaneous bandwidth at a --3-dB level is 150-100 MHz, dependhsg on the net gain. The noise temperature at the input does not exceed 25° K.