The VTM-6392M4B from Communications & Power Industries is a Traveling Wave Tube with Frequency 8 to 18 GHz, Power 320 W, Gain 35 dB, Collector Voltage 0.48 Ew to 0.52 Ew kV (DC), Cathode Current 350 mA(DC). Tags: Helix. More details for VTM-6392M4B can be seen below.