Sensibly equivalent¶ to:
The VR116 is a pentode and has an external metalising that obscures the electrodes and construction.
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 aricle 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 receiving type from before 1941 when the CV system was introduced. A manufacturing date in the 1930s is most probable.
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 80 mm tall.
References: Data-sheet & 1040.
Absolute Maximum Operating Conditions¶
Updated October 13, 2012. shape:classic construction:pinch type:pentode age:1930.1940 base:mo heater:6.3v pins:8 pin:1.h pin:2.k pin:3.a pin:4.g2 pin:5.g3 pin:6.m pin:7.nc pin:8.h pin:tc.g1