Abstract: A microwave amplifier for amplifying microwave signals, such as the microwave signals received by a microwave repeater station. The amplifier is formed of solid state amplifier-transistors to which the microwave signals are applied by way of transmission lines. The amplification circuitry and transmission lines are formed upon a circuit board which is housed within a heat-dissipative housing. The amplifier can be used in substitution for a conventional travelling wave tube, conventionally utilized to amplifier microwave signals received at a microwave repeater station.