The CD66A, produced by NEC in Japan, is a medium-sized Nixie tube capable of displaying all ten digits along with a right decimal point. It features a distinctive anode design made up of multiple horizontal wires, differing from the typical hexagonal or square grids stamped from sheet metal in most Nixie tubes. A variant of the CD66 with a left decimal point was also available. In Europe, the CD66 was sold as the ZM1242.

The LD-836 is a medium-sized Nixie tube manufacured by NEC in Japan, notable for its highly unusual, nearly rectangular glass envelope. This distinctive shape makes the tube’s front face significantly narrower than that of comparable Nixies and allows multiple tubes to be placed closer together in display assemblies. In addition to displaying the digits 0 through 9, the LD-836 also includes a right-hand decimal point. Its internal design closely resembles that of NEC’s CD66A, sharing a similar wire anode assembly, which leads to significantly improved digit visibility compared to the more typical grid design. The LD-836 is an exceptionally rare Nixie tube, with barely any information being available on it publicly.