The GR10G digitron was manufactured by ETL. It is a large nixie tube with the unusual feature of not having a solid backing to the digits, so the digits can be seen from the back too.
It also has unusually high maintenance voltage of around 180V (140V is more normal) and a high current requirement for digits of this size of around 7.5mA. Couple these characteristics with the fact that the tube has a short lifetime (due to it not being doped with mercury) means that this is not a good tube for use in a clock – which is a shame, as its unusual construction makes it very attractive.
| Digit size | 30mm |
| Min current | 6mA |
| Max current | 9mA |