The 3C22 is a transmitting triode capable of 125W at 1.5GHz.
It was used in the AN/APT-5 radar jamming transmitter. Interestingly this was used as the local oscillator in equipment used to discover the 21cm interstellar hydrogen line in 1951.
The construction is cylindrical with a flat top cathode cylinder and a flat top copper anode placed close to either side of a mesh grid.
The GE logo on the right.
The woven grid mesh seen from the cathode side.
The anode and the grid mesh.
The IO base.
The wide glass tube envelope is 25 mm in diameter, and excluding the IO base pins is 107 mm tall.
