The VTX-6389G4 from Communications & Power Industries is a Traveling Wave Tube with Frequency 7.9 to 8.4 GHz, Power 2.25 kW, Gain 49 dB, Collector Voltage 60% of Ew kV (DC), Cathode Current 0.9 mA(DC). Tags: Helix. More details for VTX-6389G4 can be seen below.