The 250T6G18 from AR RF/Microwave Instrumentation is a RF Amplifier with Frequency 6 to 18 GHz, Gain 54 dB, Gain Flatness ±6 dB, Harmonics 5 dBc, AC Voltage 190 to 260 V. Tags: Travelling Wave Tube Amplifier. More details for 250T6G18 can be seen below.