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The Tuneon is a neon tuning indicator. These neon column indicators pre-date the CRT type of 'magic-eye' 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 3184 and the 3180 from Cossor.

The working electrode is a simple rod within the tube.

The thin glass tube envelope is 13 mm in diameter and, excluding the base pins, is 103 mm tall.

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

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.