| CV78 grounded-anode triode
 |
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 |
|
 |
