Sensibly equivalent¶ to:
The VR65A is an amplifier pentode with external zinc loaded paint metalisation as shielding. The 4.0 V heater was common in the 1930s when mains sets first began to appear.
By the 1960s they were again in limited demand for maintaining ex-Services test equipment (oscilloscopes, etc.) which was then popular in Amateur circles, and in Third-World countries.
The reverse has the detail 0LW17 in a circle..
The classic envelope is 32 mm in diameter and, excluding the MO base pins, is 80 mm tall.
References: Private communication, datasheet, 1040 & 1043. Type VR65A was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated May 05, 2019. shape:classic construction:pinch type:pentode age:1930.1940 base:mo heater:4.0v pins:8 pin:1.h pin:2.k pin:3.a pin:4.g2 pin:5.g3 pin:6.m pin:7.- pin:8.h pin:tc.g1