CV78 grounded-anode triode
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This valve measures 67x35mm overall and has a B9G base |
This valve is of a similar internal construction to the CV172 noise diode.
| Heater voltage | 6.3V | |
| Heater current | 0.6A | |
| Max anode voltage | 250V | |
| Max anode dissipation with grid leak <1k ohm | 8W | |
| Max anode dissipation with grid leak > 1k ohm | 4W | |
| Mutual conductance | At Va=250V, Ia=32mA | 15mA/V |
| Amplification factor | 50 | |
| Anode impedance | 3100 ohms | |
| Efficiencies as as oscillator | ||
| 50cms | 4% | |
| 60cms | 12% | |
| 70cms | 18% | |
| 80cms | 32% | |
| 90cms | 27% | |
| 100cms | 30% | |
| Capacitances | ||
| Cag | Measured with spigot connected to anode | 7.4pF |
| Ca (c+h) | 6pF | |
| Cg (c+h) | 5.7pF | |
| Pin | Function |
| 1 | Heater |
| 2 | Anode |
| 3 | Anode |
| 4 | Grid |
| 5 | Grid |
| 6 | Anode |
| 7 | Anode |
| 8 | Cathode |
| 9 | Heater |
