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GTE120Y is a cold cathode trigger tube with a priming electrode.

The applications include switching and timers.

The Ericsson name and the rest of the Type designation.

The black interior hides the internal structure.

Even looking up from the base little is revealed.

The thin glass tube envelope is 9.3 mm in diameter and, excluding the base wires, is 33 mm tall.

References: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.