25.5mm numeric tube manufactured by STC

The GN-5A is a numeric nixie tube manufactured by STC. It can display the numbers 0-9 and has 25.5mm high digits. Its one of the biggest tubes that STC made. It has a very large base assembly which looks like the base of the russian IN-1 tube. The glass envelope has a black foil tape around it, to give the digits more contrast.
Brand / Manfacturer STC
Same Types
Likely Tyes
Symbol height in mm 25.5
Characters / Symbols 0-9
Decimal point none
Base / Socket 0
Starting Voltage (typ) 200 V
Maintaining Voltage (typ) 0 V
Current per Segment 3.5mAmA
Reccomend Resistor 18kOhm @ 200V, 33kOhm @ 250V, 47kOhm @ 300V, 75kOhm @ 400V, according to Datasheet