CV2171 (A2087) noise diode for frequencies up to 500MHz.
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The valve measures 52x17mm overall and has a B7G 7-pin base. |
The valve has a tungsten filament and so is a bright emitter.
| Normal filament voltage | 3.7 - 4.4V |
| Mean filament current (Vf=3.7V) | 0.58A |
| Mean saturated anode current (Vf=3.7V) | 5mA |
| Mean filament current (Vf=4.4V) | 0.64A |
| Mean saturated anode current (Vf=4.4V) | 20mA |
| Max filament voltage | 4.8V |
| Max anode voltage | 200V |
| Max saturated anode current | 20mA |
| Max anode dissipation | 2W |
| Capacitance, anode to filament | 0.8pF |
| Capacitance, anode to all | 2.3pF |
The specifications of the valve say that saturated emission of 5mA should be obtainable at a maximum anode voltage of 40V. At 20mA saturation, the valve life is reduced to 100-300 hours. The value of saturated anode current varies with filament voltage. The prototype of this valve was VX3120.
| Pin | Function |
| 1 | A |
| 2 | Getter support |
| 3 | F |
| 4 | F |
| 5 | A |
| 6 | n/c |
| 7 | Filament spring |
