An X-band intermediate power traveling-wave amplifier tube

This paper will show the development of an intermediate power amplifier tube for the frequency range of 8 to 11 kMc. Small signal gain curves obtained with a constant power output swept-frequency source from 8 to 11 kMc are shown. The tube is provided with an isolated grid which allows modulation of the signal from full gain to cut-off to be obtained. Modulation characteristics are shown by power output versus power input curves taken for various grid voltages over the entire frequency range. The converging beam electron gun is operated at 1100 volts with approximately 8 ma of current. Design parameters of the tube are briefly discussed, including the magnetic field requirements.