LL-561
10 mm symbol tube manufactured by Dolam
The LL-561 is a clear glass symbol tube manufactured by Dolam. It can display the plus sign, minus sign and a triangle symbol
| Manufacturer | Dolam |
|---|---|
| Characters | +,-,triangle |
| Character height | 10 mm |
| Decimal point | none |
| Base (pinout) | – |
| Starting voltage (typ.) | 170 V |
| Maintaining voltage (typ.) | 150 V |
| Current per segment | 2 mA |
| Recommended resistor | 10kOhm = 2mA |
Equivalent tubes are either the exact same type made by a different manufacturer, or models that differ only very slightly from this version (e.g. red coating instead of clear glass).
Similar tubes share electrical and mechanical specifications with this tube, but are not exact replicas.
