Litton L-3403 Klystron

From the Litton Installation and Operation Manual:

"The L-3403 Klystron is a four-cavity, modulating anode, pulsed klystron amplifier which can be mechanically tuned to amply any frequency within the range from 400 to 450 MHz. The tube will produce a peak power output of 1.25 MW at an average RF power output of 75 kW at a 0.06 duty factor with a minimum power gain of 35 dB. The efficiency of the tube is 35%, so 75 kW output power requires 223 kW of beam power. When the proper voltages are applied to the tube, a beam off electrons is formed at the cathode end of the tube and travels axially though the tube to the collector. The beam is maintained in its cylindrical shape by an axial magnetic field produced by eight external electromagnets. The beam passes through four internal cavity resonators. With RF power applied to the input cavity, and with the four cavities tuned properly, the amplified signal is available at a coaxial output connector. After the electrons pass through the cavities, they impinge on the inner surface of the collector and the remaining beam energy is converted to heat with is carried away by liquid coolant."