ZM1023
15.5mm symbol tube manufactured by Mullard
The ZM1021 is a clear glass symbol tube manufactured by Mullard. It was used in measurement devices along with the numeric ZM1020 tube. There is also a red coated version, the ZM1021
| Brand / Manfacturer | Mullard |
| Same Types | |
| Likely Tyes | |
| Symbol height in mm | 15.5 |
| Characters / Symbols | +,-,%,Ω,V,A,sinewave |
| 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 |
