Sophia Electric 2A3 Vacuum Tube Specification
| Filament voltage | *2.5V |
| Nominal filament current | 2.5A |
| Plate voltage | 250V |
| Grid voltage (AC filament) | -45V |
| Plate current | 60mA |
| Plate current | 62.5 mA |
| Amplification factor | 4.2 |
| Grid current | 0.05 uA |
| Plate resistance | 800 ohms |
| load resistance | 2500 ohms |
| Maximum plate voltage | 300 volts |
| Maximum plate dissipation | 15 watts |
Sophia Electric 2A3 mesh tube plate curves