18mm numeric tube manufactured by Reflector/Sovtek

The IN-1 is a very common 18mm digit size tube. Its broadly available in serveral online stores. The tubes body is rater massive for its digit size and the tube has a nice glass dome. Due its special size it is not very suitable for any projects that require to be small sized. The "5" on the IN-1 is a inverted 2 like in many russian nixie tubes.
Same Types
Likely Tyes
Symbol height (mm)18
Decimal pointnone
Starting Voltage (typ)170 V
Maintaining Voltage (typ)135 V
Current per Segment3mA
Reccomend Resistor12.6kOhm = 2.8mA