The VTC-6361H1X from Communications & Power Industries is a Traveling Wave Tube with Frequency 5.850 to 7.025 GHz, Power 400 W, Gain 50 dB, Collector Voltage 4.6 to 6.4 kV (DC), Cathode Current 350 mA(DC). Tags: Helix. More details for VTC-6361H1X can be seen below.