15.5mmmm numeric tube manufactured by Wang Lab
The 340-0004 is a clear glass numeric nixie tube manufactured by Wang Labs. Wang Labs made calculators. Its very similiar the NL-840, and its really likely that this tube was manufactured by National Electronics for Wang, because the printing on the tube is identical style.
|Symbol height (mm)||15.5mm|
|Starting Voltage (typ)||170V V|
|Maintaining Voltage (typ)||0 V|
|Current per Segment||3mAmA|
|Reccomend Resistor||8.2kOhm @ 170V|