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The Z900T is a cold cathode trigger tube and therefore very similar to a thyratron.

The picture shows the rear of the cathode, it is a curved plate and looks like the cathode of a photocell. In front of the cathode is a control electrode, and at the front of the envelope is the anode. This hollow tube is shielded in a glass tube for most of its length. To the side of the anode is a small round electrode.

The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.