CV2220 / CVX2220 / 5B/257M beam tetrode
 |
This valve measures 89x30mm overall and has a B8G base |
| Heater voltage | 12V |
| Heater current | 470mA |
| Max anode voltage | 600V |
| Max screen voltage | 300V |
| Max anode current | 120mA |
| Max anode dissipation | 25W |
| Max screen dissipation | 4.5W |
| Mutual conductance * | 6.0mA/V |
| Inner µ * | 9.0 |
| Max frequency for above ratings | 60MHz |
| Capacitances | |
| Cag | 0.13pF |
| Cge | 12pF |
| Cae | 8.5pF |
*: At Va=300, Vg2=250, Ia=72mA
| Pin | Function |
| 1 | Heater |
| 2 | Anode |
| 3 | Screen grid |
| 4 | Cathode + beam plates |
| 5 | Control grid |
| 6 | Control grid |
| 7 | Cathode + beam plates |
| 8 | Heater |
Above: CV2220; below: CVX2220. Both are also marked 5B/257M
