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).
Brand / Manfacturer Reflector/Sovtek
Same Types
Likely Tyes
Symbol height in mm 18
Characters / Symbols 0-9
Decimal point left
Base / Socket SK-136
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 145 V
Current per Segment 3mA
Reccomend Resistor 8.6kOhm