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.
Brand / Manfacturer Mulllard
Same Types
Likely Tyes
Symbol height in mm 15.5
Characters / Symbols 0.9
Decimal point none
Base / Socket B13B
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 145 V
Current per Segment 2mA
Reccomend Resistor 12.5kOhm = 2mA