CV1285 / NR73 double triode
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This valve measures 102x45mm overall and has an octal base. |
This is the equivalent of the ECC31. See also CV181 which is listed as a modified NR73.
| Heater voltage | 6.3V |
| Heater current | 950mA |
| Max anode voltage | 300V |
| Anode current * | 6mA |
| Mutual conductance * | 2.3mA/V |
| Amplification factor * | 32 |
| Anode impedance * | 14k ohms |
| Max anode dissipation | 5W |
| Max cathode current | 50mA |
| Capacitances | |
| Ca-all | 1.0pF |
| Triode 1 | |
| Cag | 3.4pF |
| Cgc | 4.0pF |
| Cac | 1.9pF |
| Triode 2 | |
| Cag | 3.75pF |
| Cgc | 4.0pF |
| Cac | 1.0pF |
*: At Va=250, Vg=-4.6.
| Pin | Function |
| 1 | n/c |
| 2 | Heater |
| 3 | Anode 1 |
| 4 | Grid 1 |
| 5 | Grid 2 |
| 6 | Anode 2 |
| 7 | Heater |
| 8 | Cathode |
