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The 484V is a medium impedance audio triode that was introduced by Mullard in 1931. Mullard replaced the 484V with the 354V in 1932.

Our exhibit is shedding its external metallic screening paint. Under the paint the dome can be seen to have etched identification on the glass.

The anode is a wire mesh and the electrodes are held on a side bar just like the early Azide valves.

Some of the paint flaked off during the taking of the pictures. The paint is both thin and brittle.

The jagged edge of the paint and the inner surface is polished by contact with the envelope.

Another view of the anode and on the right the wire grid.

More detail of the anode length, grid and cathode.

The edge of the anode and the glass support for the electrodes. Note also how the paint is separating from the envelope.

A much clearer view of the anode, showing the open mesh construction. The grid construction and the cathode in the centre at the top.

The balloon envelope is 46 mm in diameter, and excluding the base B5 pins is 94 mm tall.

References: ³⁰⁰² & ¹⁰⁴³. Type 484V was first introduced in 1931. See also 1931 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶