The VTC-6660C from Communications & Power Industries is a Traveling Wave Tube with Frequency 5.925 to 6.425 GHz, Power 12 kW, Gain 35 dB, Collector Voltage 0.75 to 0.85 kV, Cathode Voltage -21 to -18 kV. Tags: Coupled Cavity. More details for VTC-6660C can be seen below.