tubes

CD-12

Rodan-Okaya CD-12 tube

GI-10

GI-10 Inditron. Widely accepted to be the first mass-produced 'nixie'.

GI-21

GI-21 Inditron

GR10J

The GR10J numicator by HIVAC

NL5441A

A smooth-topped version of the B5441/NL5441. This became very popular when a few Divergence Meters were built using this tube.