NT39 / CV1222 / ACT6 Air Cooled Triode (ACT)
 |
This valve measures 220mm x 50mm and has a 4-pin base. |
This is an external anode triode designed to be air cooled.
| Filament voltage | 10V |
| Filament current | 1.65A |
| Max anode voltage | 1500V |
| Max anode dissipation | 75W |
| Amplification factor | 22 |
| Mutual conductance | 5.0mA/V |
| Anode impedance | 4200 ohms |
| Max frequency for 75% anode rating | 37MHz |
| Pin | Function |
| 1 | n/c |
| 2 | Filament |
| 3 | Grid |
| 4 | Filament |
| TC | Anode |
Top view
of the valve, above, and an internal view, below.
The NT39/CV1222 above has "No. 3880c 38X"
etched on the glass under the part number.
The ACT6 below carries the number 7120.
