The 200TR4G8 from AR RF/Microwave Instrumentation is a RF Amplifier with Frequency 4 to 8 GHz, Gain 53 dB, Gain Flatness ±12 dB, Harmonics 4 dBc, AC Voltage 190 to 260 V. Tags: Travelling Wave Tube Amplifier. More details for 200TR4G8 can be seen below.