The 6561 from Ophir RF is a RF Amplifier with Frequency 2 to 4 GHz, Gain 69 dB, Output Power 68.38 to 69.29 dBm, Output Power 6900 to 8500 W, Harmonics -10 dBc. Tags: Benchtop / Rackmount, Travelling Wave Tube Amplifier, Power Amplifier, Automatic Gain Controlled Amplifier. More details for 6561 can be seen below.