The CV1256 is a radar power triode or micropup and was designed for 50 cm operation and with a maximum anode dissipation of 150 Watts. The prototype was the E1232 experimental M-OV tube. The old service code was NT99.
The anode with cooling fins. The filament connections are at the top of the glass.
The threaded grid connection.
The end plate and filament connection screens the view of the grid.
The filament connection rods are terminated with stranded copper wires.
The glass envelope is 34 mm in diameter and, including the base rods, is 123 mm tall.