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This exhibit has lost its identification, but is probably a PL38 or EL38. Visually it can be seen to be a pentode with the anode brought out to the top cap. The substantial anode box and ceramic insulators hint at a high voltage power application, probably as a television line output valve.

The classic envelope is 42 mm in diameter and, excluding the IO base pins, is 103 mm tall.

Reference: Observation.