The VTU-6397V1C from Communications & Power Industries is a Traveling Wave Tube with Frequency 12.75 to 14.5 GHz, Power 625 W, Peak Output Power 1.25 kW, Gain 54 dB, Collector Voltage 51 to 53 kV (DC). Tags: Helix. More details for VTU-6397V1C can be seen below.