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This exhibit is a Cunningham double filament tubular Audiotron number 110 (#110). The base is a separate UV type with screw terminal connections. The locating pin on the brass base shell does not engage with the base and thus the base does not look to be a standard UV type.

The black printed paper identification label is marked 'Audiotron' and is of the third type used by Cunningham.

Thanks to Joe Gruber for sending the images.

The thin glass tube envelope is 19 mm in diameter and, including the UV base pins, is 92 mm tall.

Reference: Joe Gruber. Type 110# was first introduced in 1916. See also 1916 adverts.

Pin Connections