Making a Five-Segment Display with Platinum-Titanium Cathodes hackaday.com

Witchcraft and Alchemy built a five-segment gas display inspired by Burroughs Panaplex, using argon and platinum cathodes deposited over a titanium layer on glass. A prototype driven by a 74141 Nixie driver glowed purple in a vacuum chamber, but a sealed version quickly failed; the team plans a gasket, conductive vias, two more segments and a Penning gas mixture.