The AA-818G-400-GT from Advanced Amplifiers is a RF Amplifier with Frequency 7.5 to 18 GHz, Gain 56 dB, Output Power 400 W, Peak Power 56 dBm, Spurious -60 to -55 dBc. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier. More details for AA-818G-400-GT can be seen below.