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The CV326 is a lighting arrestor with a breakdown voltage between 250 and 350 Volts. This cold cathode tube has a low pressure gas filling.

The prototype was the Siemens Type 15B.

The AEI logo stamped into the end caps.

The commercial 15B appears on the end caps.

A closer view of the two domed electrodes.

Here the two part construction of the electrodes is easier to see.

The thin glass tube envelope is 18 mm in diameter and, 10cluding the base caps, is 67 mm tall.

References: Data-sheet.

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum