The Model 400K from Applied Systems Engineering is a RF Amplifier with Frequency 17.7 to 22 GHz, Gain 57 dB, Noise Figure 35 dB, Output Power 56.53 dBm, Output Power 450 W. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier, Driver Amplifier. More details for Model 400K can be seen below.