The 6557 from Ophir RF is a RF Amplifier with Frequency 12 to 18 GHz, Gain 67 dB, Gain Flatness ±3 dB, Output Power 67.4 dBm, Output Power 5500 W. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier. More details for 6557 can be seen below.