20F2 screened pentode
 |
This valve measures 67x22mm overall and has an 8 pin B8A base |
This screened pentode is designed for TV use
| Heater voltage |
11V |
| Heater current |
200mA |
| Max anode voltage |
250V |
| Max screen voltage |
250V |
| Mutual conductance * |
10.6mA/V |
| Anode impedance * |
125k ohms |
| Inner amplification factor * |
33 |
| Max anode dissipation |
4W |
| Max screen dissipation |
1W |
| Max heater/cathode voltage |
250V |
| Capacitances |
| Cout |
4.6pF |
| Cag1 |
0.007pF |
| Cin |
8.8pF |
*: At Va=Vg2=140, Vg1=-1.25.
| Pin |
Function |
| 1 |
Heater |
| 2 |
Anode |
| 3 |
Internal shield |
| 4 |
Suppressor grid |
| 5 |
Screen grid |
| 6 |
Control grid |
| 7 |
Cathode |
| 8 |
Heater |
|
 |
