High power microwave devices, like crossed-field amplifier, are not phase-stable.

This led to the development of the crossed-field amplifier, a simple, reliable and highly efficient microwave amplifier.

Cavity magnetron and crossed-field amplifier are not appropriate because noise introduced by these devices interfere with detection performance.

William C. Brown is considered to have invented the first crossed-field amplifier in 1953 which he called an Amplitron.

A crossed-field amplifier (CFA) is a specialized vacuum tube frequently used as a microwave amplifier in very-high-power transmitters.

By 1952 his work on adapting magnetron principles to create a new broadband amplifier resulted in the 'Amplitron', today known more commonly as a crossed-field amplifier (CFA).

Many microwave amplifiers are specially designed valves, such as the klystron, gyrotron, traveling wave tube, and crossed-field amplifier, and these microwave valves provide much greater single-device power output at microwave frequencies than solid-state devices (p. 59).