18mm numeric tube manufactured by Reflector/Sovtek
The IN-12B is a very common end-view numerical readout tube with 18mm character height. Its probably one of the most used tubes for nixie projects due its good availability and price. It can be replaced directly by the IN-12A (which lacks a decimal point), and has matching special character tubes (IN-15A and IN-15B).
|Symbol height (mm)||18|
|Starting Voltage (typ)||170 V|
|Maintaining Voltage (typ)||145 V|
|Current per Segment||3mA|