ZM1021

15.5mm symbol tube manufactured by RTC

The ZM1021 is a red coated symbol tube manufactured by RTC. It was used in measurement devices along with the numeric ZM1020 tube. There is also a clear version, the ZM1023
Brand/ManfacturerRTC
Same Types
Likely Tyes
Symbol height (mm)15.5
Display+,-,%,Ω,V,A,sinewave
Decimal pointnone
BaseB13B
Starting Voltage (typ)170 V
Maintaining Voltage (typ)145 V
Current per Segment2mA
Reccomend Resistor12.5kOhm = 2mA

Note:

See ZM1021 Mullard for images of the digits