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The 3184 is a most unusual neon tuning indicator. Within the thin glass tube is a wire rod and a pair of circular electrodes. To function as a tuning indicator it produced a column of glowing plasma that changed length by virtue of a changing control potential.

See also the 3180 from Cossor.

The thin glass tube envelope is 12 mm in diameter and, excluding the base pins, is 91 mm tall.

References: Data-sheet & ⁴⁰¹⁰. Type 3184 was first introduced in 1934. See also 1934 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.