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This exhibit is a B6 detector triode. It is a soft valve but the ions within are not specified. The heater is wound around the pinch stem. The construction points to the use of sodium ions as with his earlier valves.

The designer was Dr H P Donle, (chief engineer at ). In 1925 Dr H P Donle left the Connecticut Telephone and Electric Company to establish his own company - the Donle Bristol Corporation of Meriden, Connecticut.

See B-6 that looks to be the same valve.

The original box.

Thanks to Joe Gruber for sending the images.

The wide glass tube envelope is 32 mm in diameter and, including the UX base pins, is 101 mm tall.

Reference: Joe Gruber & ¹⁰⁴⁷.