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The 4313C is a cold cathode thyratron based on the 313C ITT (USA) design. STC being a subsidiary of the ITT and generally differentiating its Type designations from ITT by the addition of the 4 as a prefix.

The UK Government procurement specification was the CV75.

The electrodes with the trigger being seen as a diagonal wire.

The wide glass tube envelope is 28 mm in diameter, and excluding the UX4 base pins is 70 mm tall.

References: Data-sheet & ¹⁰⁴⁰. Type 4313C was first introduced in 1945. See also 1945 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.