The 6558 from Ophir RF is a RF Amplifier with Frequency 4 to 8 GHz, Gain 68 dB, Output Power 68.45 dBm, Output Power 7000 W, Harmonics -3 dBc. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier, Automatic Gain Controlled Amplifier. More details for 6558 can be seen below.