STC 5B/255M (CV391) beam tetrode
 |
This valve measures 90x30mm overall and has a loctal base |
| Heater voltage | 6.3V | |
| Heater current | 0.9A | |
| Max anode voltage | 600V | |
| Max screen voltage | 300V | |
| Max anode current | 120mA | |
| Max anode dissipation | 25W | |
| Max screen dissipation | 4.5W | |
| Mutual conductance | 6mA/V | |
| Inner amplification factor | (Va=300V;
Vg2=250V; Ia=72mA) |
9 |
| Max frequency for above ratings | 60MHz | |
| Capacitances | ||
| Cag | 0.13pF | |
| Cge | 12pF | |
| Cae | 8.5pF | |
| Pin | Function |
| 1 | Heater |
| 2 | Anode |
| 3 | Screen grid |
| 4 | Internal shield |
| 5 | Control grid |
| 6 | Control grid |
| 7 | Cathode and beam plates |
| 8 | Heater |
