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The H406 is a detector triode. This exhibit has lost integrity in the cemet seal between the glass and the base.

Neutron was a small British manufacturer operating around the mid 1920s only.

The base pins are of the simple split pin variety. The anode pin is indicated by the raised line on the base.

The electrodes are mounted vertically as can just be seen under the gettering.

A little more detail in the grid, and the supports that once held a single inverted V filament can just be seen.

The balloon envelope is 44 mm in diameter, and excluding the B4 base pins is 97 mm tall.

Reference: ¹⁰⁴³. Type H406 was first introduced in 1926. See also 1926 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶