ZM1042

30 mm numeric tube manufactured by Valvo

The ZM1042 is a clear glass indicator tube with characters of 30mm. Due its large characters, it has become one of the rare tubes This tube was produced by multiple factories like Valvo,Tesla and Philipps. I dont know much about the orginally usage of these tubes, but i think they where probably used in measuremnt devices (e.g. Voltmer) just like the Z566M. This tube uses the B13B socket and is directly replaceable by ZM1042,Z566,Z5660 etc
ManufacturerValvo
Characters0-9
Character height30 mm
Decimal pointnone
Base (pinout)B13B
Starting voltage (typ.)170 V
Maintaining voltage (typ.)40 V
Current per segment4.5 mA
Recommended resistor6.8kOhm = 4.5mA
ZM1042 – photo 1ZM1042 – photo 2
ZM1042 – character 1ZM1042 – character 2ZM1042 – character 3ZM1042 – character 4ZM1042 – character 5ZM1042 – character 6ZM1042 – character 7ZM1042 – character 8ZM1042 – character 9ZM1042 – character 10
ZM1042 – additional photo 1