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NU5 halfwave rectifier of WWII vintage. 13.5V/9.5A filament, 3kV/150mA rating. Markings on the glass are: Admiralty Pattern 7416, and Serial Number 6811C year 1943.

NU5 filament
The filament is a classic hairpin of tungsten, connected at one end of the bulb (top in the main picture)

NU5 filament spring
The filament is tensioned by a spring at the other end. Note also above and below the soldered joint between the wire and the anode.

NU5 anode wire

NU5 size indication
The valve measures 250x120mm.

.NU5

This file was last modified 15:09:22, Tuesday September 02, 2014