Eimac CAA 322 Transmitting Electron Vacuum Tube Planar Triode

The Eimac CAA 322 is a vintage transmitting electron vacuum tube that uses a planar triode configuration. Manufactured by Eimac, this tube was designed to act as the amplifying element in RF transmission equipment, employing the planar triode geometry that characterized mid‑century high‑power valves. The CAA 322 model name identifies this specific tube within Eimac’s lineup, making it recognizable to collectors and restorers of vintage radio and transmitter gear. Its robust, compact planar design reflects the engineering approach of its era and it remains of interest to hobbyists, restorers, and educational displays seeking a tangible example of vacuum‑tube amplification. Because this is a historic transmitting tube, it is most often encountered in collection or restoration contexts rather than modern production systems.