The VTU-6399X1 from Communications & Power Industries is a Traveling Wave Tube with Frequency 12.75 to 14.5 GHz, Power 220 W, Peak Output Power 0.4 kW, Gain 50 dB, Collector Voltage 49 to 51 kV (DC). Tags: Helix. More details for VTU-6399X1 can be seen below.