40mm numeric tube manufactured by Siemens
The ZM1220 is a red coated numeric nixie tube manufactured by Siemens. It has a digit-height of 40mm and is very rare. Currently, i don't have any more information about the tube.
|Symbol height (mm)||40|
|Starting Voltage (typ)||tested at 180V, 10kOhm V|
|Maintaining Voltage (typ)||0 V|
|Current per Segment||0mA|