Ferranti BDM20 dual tetrode
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This valve measures 136x45mm overall and has an octal base. |
This valve is described as an electrometer dual tetrode.
| Heater voltage |
8V |
| Heater current |
120mA |
| Typical operating conditions |
| Anode voltage |
4V |
| Screen voltage |
3V |
| Control grid voltage |
-1.75V |
| Anode current |
100µA |
| Screen current |
80µA |
| Mutual conductance |
90µA/V |
| Amplification factor |
2 |
| Control grid current |
3x10-14A |
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