Transmitting Tube Hot Cathode Characteristics
| Material | Operating temperature | Emission efficacy | Specific emission |
|---|---|---|---|
| Tungsten | 2500 K | 5 mA/W | 500 mA/cm2 |
| Thoriated tungsten | 2000 K | 100 mA/W | 5 A/cm2 |
| Oxide coated | 1100 K | 500 mA/W | 10 A/cm2 |
| Barium aluminate | 1300 K | 400 mA/W | 4 A/cm2 |
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