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The 313CC is a cold cathode Thyratron for low current trigger service. The valve contains a small quantity of radioactive krypton 85 gas.
The UX4 base pins and maker's identification on the base cap.
Thanks to Mark Mallison for sending the images.
The wide glass tube envelope is 29 mm in diameter and, excluding the UX4 base pins, is 70 mm tall.
Reference: Datasheet. Type 313CC was first introduced in 1962.


Absolute Maximum Operating Conditions
PDF scanned from an original document held by the museum
Updated March 04, 2020.
shape:wide.glass.tube construction:pinch type:thyratron age:1930.1940 base:ux4 pins:4 pin:
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