Osram DA41 audio power triode
 |
This valve measures 150x50mm
overall and has a 4 pin base. |
The DA41 is a carbon anode
power amplifying triode with a thoriated tungsten filament. It is designed
mainly for use in pairs in a positive grid drive Class B push-pull AF
amplifier. Under suitable conditions an output of up to 175W can be obtained
from a pair of these valves at an anode voltage of 1000V. It is designed
to operate under the zero grid bias condition.
| Filament voltage |
7.5V |
| Filament current |
2.5A |
| Max anode voltage |
1000V |
| Max anode dissipation |
40W |
| Amplification factor * |
62 |
| Anode impedance * |
17500 ohms |
| Mutual conductance * |
3.6mA/V |
| Capacitances |
| Cag |
5.9pF |
| Cgf |
10.0pF |
| Caf |
1.8pF |
*: At Va=1000V, Wa=40W
| Pin |
Function |
| 1 |
Filament |
| 2 |
n/c |
| 3 |
Grid |
| 4 |
Filament |
| TC |
Anode |
| Operating
conditions (pair in push-pull Class B |
| Anode voltage |
1000V |
| Grid voltage |
0 |
| Anode current (zero signal) |
44mA |
| Anode current (max signal) |
280mA |
| Load resistance (anode
to anode) |
7k ohms |
| Input voltage peak (grid
to grid) |
220V |
| Grid current (max signal) |
30mA |
| Power output |
175W |
| Distortion |
5% |
|
