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The RG3-250 is a mercury vapour half-wave power rectifier. The anode is caged to reduce the emission of x-rays from the envelope. Such a rectifier would have been used in transmitting or radar equipment. See also RG3-250A the variant where the top cap is of the top hat style.

The filament and cathode connects to the base and the anode to the top-cap.

The classic envelope is 42 mm in diameter and, is 147 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type RG3-250 was first introduced in 1938. See also 1938 adverts.

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum