Crossed-field amplifier
（重定向自Amplitron）
![](/Images/godic/202412/20/CFA_L-4756A4509.jpg")
![Crossed-field amplifier internal operation](/Images/godic/202412/20/Crossed_field_amplifier4509.png")
A crossed-field amplifier (CFA) is a specialized vacuum tube, first introduced in the mid-1950s and frequently used as a microwave amplifier in very-high-power transmitters.
Raytheon engineer William C. Brown's work to adapt magnetron principles to create a new broadband amplifier is generally recognized as the first CFA, which he called an Amplitron. Other names that are sometimes used by CFA manufacturers include Platinotron or Stabilotron.