Results of designing ultralow-noise coolable amplifiers intended for operation in a 0.5- to 3.0-GHz wavelength range are presented. Schematic diagrams are given, and special features of the design are indicated. The noise factor of the amplifier is ～0.4 dB without cooling and ≤0.05 dB at 15 K. The commercially available electronic components are used. The amplifiers are recommended as functional modules for building radio-astronomy and measuring units.
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