The VTC-6660E from Communications & Power Industries is a Traveling Wave Tube with Frequency 5.925 to 6.425 GHz, Power 40 kW, Gain 35 dB, Collector Voltage 0.77 to 0.83 kV, Cathode Voltage -39 to -36 kV. Tags: Coupled Cavity. More details for VTC-6660E can be seen below.