ZM1020 (Z520M)

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.
Same Types
Likely Tyes
Symbol height (mm)15.5
Decimal pointnone
Starting Voltage (typ)170 V
Maintaining Voltage (typ)145 V
Current per Segment2mA
Reccomend Resistor12.5kOhm = 2mA