CV820 / 3S4 power amplifier pentode
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This valve measures 51x17mm overall and has a B7G base. |
See also CV484 which also carries the 3S4 marking.
| Filament voltage | 1.4/2.8V |
| Filament current | 100/50mA |
| Max anode voltage | 100V |
| Max screen voltage | 75V |
| Mutual conductance * | 1.5mA/V |
| Anode impedance * | 100k ohms |
| Anode current * | 7.4mA |
| Screen current * | 1.4mA |
| Max cathode current | 13mA |
*: At Va=90, Vg2=67.5, Vg1=-7.
| Pin | Function |
| 1 | Filament -ve ** |
| 2 | Anode |
| 3 | Control grid |
| 4 | Screen grid |
| 5 | Filament -ve, Suppressor grid ** |
| 6 | Anode |
| 7 | Filament +ve ** |
**: Pin1 is filament -ve for 2.8V operation; pin 5 is -ve for 1.4V where pins 1 and 7 are filament +ve.
