CV2321 gas filled voltage stabiliser or reference tube. It measures 35x15mm, and contains two identical elements inside consisting of a loop at the end of a wire. The wire is encased in glass.
It is a special quality version of the GD86, tested for striking voltage in both light and dark conditions, and for voltage stability versus current.
| Max striking voltage in total darkness (a) | 165V |
| Max striking voltage in normal laboratory illumination (1) | 125V |
| Normal stabilised voltage | 86V |
| Recommended operating current | 0.4 to 1.0mA |
| Max change of stabilised voltage with variation of current from 0.4 to 1.0mA | 3.3V |
| Max current required to keep valve struck | 50µA |
| Insulation resistance of unstruck valve | 500MΩ |
