Sensibly equivalent¶ to:
The WWII EF50 in a plain aluminium screening can and carrying the UK Air Ministry branding. The VR91 is Valve Receiving number 91.
This amplifier pentode was a general workhorse. It was extensively used in radio and radar during WWII.
The pins are equi-spaced around the circumference of the pin circle.
This example was made in Canada by Rogers.
The dimensions are 32 mm in diameter for the body of the screening can, and 60 mm in length, excluding the short B9G pins and the central spigot that locates the pins and covers the evacuation seal.
References: 1040. Type VR91 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated December03, 2012. shape:wide.glass.tube construction:all.glass type:pentode age:1930.1940 base:b9g heater:6.3v pins:9 pin:1.h pin:2.g2 pin:3.a pin:4.g3 pin:5.s pin:6.k pin:7.g1 pin:8.s pin:9.h