The Marconi VDS is a variable μ RF pentode with a control grid range of -0.5 to -30.0 Volts. The heater rating suggests that it was used in AC/DC mains superhet radio sets.
The Marconi brand and Made in England.
The balloon envelope is 45 mm in diameter and, excluding the B5 base pins, is 120 mm tall.
Reference: 1043. Type VDS was first introduced in 1932.
Absolute Maximum Operating Conditions¶
Updated August 21, 2020. shape:balloon construction:pinch type:pentode age:1930.1940 base:b5 pins:5 pin:1.g2 pin:2.g1 pin:3.h pin:4.h pin:5.k.g3 pin:tc.a