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The GXU4 is a high power high voltage half wave xenon filled rectifier. The base is a giant Edison screw and the anode is connected to the top cap.

The anode is enclosed in a metal cage. The circular anode plate is visible through the outer mesh. The filament is within the cage and the electrons emerge from a circular hole 6 mm from the anode. The probability is that the cage is designed to reduce the emission of x-rays from the valve.

The maximum PIV is 13 kV and the maximum peak current is 5 A.

The wide glass tube envelope is 54 mm in diameter and, including the GES base, is 238 mm tall.

Reference: Internet. Type GXU4 was first introduced in 1957. See also 1957 adverts.

Absolute Maximum Operating Conditions^¶