The Amplifier Research 25A250 RF Amplifier features a frequency of 10 kHz to 250 MHz and 25W minimum output power. Flatness is  1.0 dB maximum. Input for rated output: 1.0 milliwatt. Gain (at maximum setting): 44 dB. Input/output impedance: 50 ohms. Will faithfully reproduce AM, FM, or pulse modulation appearing on the input signal.

Used- in great condition.