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CV386 pentode
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This valve measures 28x9mm overall and has a 5 leads fitted on an 8-lead base * |
*: The EVS datasheet for this valve shows three possible constructions - the 'wafer base' as
this example has, a tubular construction with a flat pinch with 5 leads inline, and a US type
rectangular section bulb, again with 5 leads inline.
| Filament voltage | 0.625V |
| Nominal filament current | 25.0mA |
| Max anode voltage | 45.0V |
| Max screen voltage | 45.0V |
| Mutual conductance * | 0.18mA/V |
| Anode impedance * | 500kΩ |
| Optimal anode load | 1.0MΩ |
| Nominal voltage gain * | 35.0 |
*: At Va=Vg2=30, Vg1=0.
| Lead | Function |
| 1 | no lead |
| 2 | Control grid |
| 3 | no lead |
| 4 | Filament -ve and suppressor grid |
| 5 | Filament +ve |
| 6 | no lead |
| 7 | Anode |
| 8 | Screen grid |
The above table shows the leads for the wafer base type construction. Other construction
styles have the 5 leads arranged as filament -ve + suppressor grid, control grid, filament +ve,
screen grid, and anode, the anode lead being marked with a red dot.
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