The CV1198 is an indirectly heated triode based on the AD/P4. The design purpose was for line scanning in TV circuits. The old service code was the Navy NR94 that looks much like this valve.
CV1190 refers to a pair of CV1198s selected such that with 1.0 kV on the anode, with a 100kΩ anode load and an anode current of 4.75 mA, the control grid voltages are within half a Volt of each other.
The anode box is much wider than the control grid allowing a greater area for heat radiation.
The CV1198 is hard to read even with image enhancement.
Face view
The classic envelope is 39 mm in diameter, and excluding the B5 base pins is 108 mm tall.
