CV820 / 3S4 power amplifier
pentode
 |
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. |
