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The 12BA6 is a variable μ pentode for use at HF within AC/DC receivers. Most probably as RF amplifiers. This exhibit from Pinnacle also carries the Type designation of HF93.

The original maker's identification is etched into the glass. Pinnacle have added the printed wording.

The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 46 mm long.

References: Data-sheet & ¹⁰⁴⁰. Type 12BA6 was first introduced in 1946. See also 1946 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.