15.5mm numeric tube manufactured by Mulllard
The ZM1020 is a red coated numerical nixie tube manufactured by Mullard. Its equal to the ZM1020 by Philips and Siemens. It looks like Mullard sold these also as a replacement for the Z520M according to the tube box.
|Symbol height (mm)||15.5|
|Starting Voltage (typ)||170 V|
|Maintaining Voltage (typ)||145 V|
|Current per Segment||2mA|
|Reccomend Resistor||12.5kOhm = 2mA|