Sensibly equivalent¶ to:
The VR116 is an HF pentode and has an external metallising that obscures the electrodes and construction. The Mazda Octal base indicates that Mazda made the valve as other manufacturers adopted the American octal now known as the International Octal.
The VR116 was specially designed for the use of the suppressor grid as a control electrode and has a cut-off of -10 Volts. See the transitron article above.
Such methods of screening were popular for valves for intermediate frequency amplification and radio frequency amplification. The grid brought out to the top cap for maximum isolation also suggests a high frequency use.
The VR designation tell us that the valve is a British military (RAF) receiving type from before 1941 when the CV system was introduced.
Plain zinc paint on the back.
The classic envelope is 29 mm in diameter and, excluding the MO base pins, is 66 mm tall.
References: Data-sheet & 1040.
Absolute Maximum Operating Conditions¶
Updated February 24, 2022.