The 2C26A is a UHF triode pulse oscillator for use at up to 300 MHz. with a cathode designed for high peak emission as is required for pulse operation.
The control grid is wound on copper rods and a curved heat-sink connects around the cathode and to the top cap in the foreground of this image.
The flattened oval of the cathode tube with two hairpins of insulated heater within.
A closer view of the top mica components.
The Hytron box for the US Government is 34 mm square and 118 mm long.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 73 mm tall.
Reference: Data-sheet. Type 2C26A was first introduced in 1944. See also1944 adverts.
