CV2901 / EF86 low hum, low microphony pentode
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This valve measures 55x19mm overall and has a B9A base. |
See also CV4085 and CV4086 which are based on this valve.
| Heater voltage | 6.3V |
| Heater current | 200mA |
| Max anode voltage (Ia=0) | 550V |
| Max screen voltage (Ig2=0) | 550V |
| Max anode dissipation | 1W |
| Max screen dissipation | 200mW |
| Max DC anode voltage | 300V |
| Max DC screen voltage | 300V |
| Max cathode current | 6mA |
| Anode current * | 3mA |
| Screen current * | 0.55mA |
| Mutual conductance * | 2mA/V |
| Anode impedance * | 2.5M ohms |
| Inner amplification factor | 38 |
| Max heater cathode voltage | 50V |
| Capacitances (without metal screen) | |
| Cag max | 0.05pF |
| Cge | 4.3pF |
| Cae | 5.1pF |
*: At Va=250, Vg2=140, Vg1=-2.
| Pin | Function |
| 1 | Screen grid |
| 2 | Shield |
| 3 | Cathode |
| 4 | Heater |
| 5 | Heater |
| 6 | Anode |
| 7 | Shield |
| 8 | Suppressor grid |
| 9 | Control grid |
