Virtual Valve Museum

Virtual Valve Museum

HomeFull List

This is an archive website. It will not receive any updates, additions or corrections.

CV2171 (A2087) noise diode for frequencies up to 500MHz.

CV2171 size 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