The ZM1041 nixie tube is a large symbol tube that can display a plus sign and a minus sign. It is red coated to improve contrast. This particular tube was made by Mullard – though it looks like a re-badged Valvo.
| Sign size | 20mm |
| Min current | 3mA |
| Max current | 6mA |
| Base | B13B |
Datasheet:
ZM1041 Datasheet