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.
Absolute Maximum Operating Conditions¶
Updated April 07, 2013.