The CD12 is a large top-view tube made by the company Rodan-Okaya. Rodan are known for making the largest (and some of the strangest looking) nixie tubes in the world.

Digit size 35mm
Min current 3.5mA
Max current 6.5mA
Base TSB-12P (B12A)

Here are some photographs of the tube from various angles, followed by a video of it in action. The datasheet is at the end.

This is an excerpt from a catalog at Dieter’s excellent web site.

CD-12 data

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