The 6559 from Ophir RF is a RF Amplifier with Frequency 4 to 8 GHz, Gain 69 dB, Output Power 66.43 to 69.03 dBm, Output Power 4400 to 8000 W, Harmonics -10 dBc. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier, Automatic Gain Controlled Amplifier. More details for 6559 can be seen below.