Sophia Electric 845 MK3 Vacuum Tube Specification
| Filament voltage | 10.0V |
| Nominal filament current | 3.2A |
| Plate voltage | 1250V |
| Grid voltage | -200V |
| Plate current | 80mA |
| Plate resistance | 1.7 Kohms |
| Amplification factor | 5.0 |
| Load resistance | 3.4 Kohms |
| Signal voltage(pk) | 69.0V |
| Output Power | 25W |