The CV1135 is a power triode based on the M-OV E1148 experimental valve that became the DET20. It is also known as the VR135 and the NR80.
The triode seen end on.
Face view of the triode. Given the pinch form of construction then available, lead inductance reduction was achieved by connecting the control grid and the anode to top caps.
The wide glass tube envelope is 28 mm in diameter, and excluding the IO base pins is 74 mm tall.
