|
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 |
|
|
