Virtual Valve Museum

Virtual Valve Museum

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CV9933 special quality pentode

Size This valve measures 65x19mm overall and has a B9A base with gold plated pins.


This valve is aimed at telephone service and has a life expectancy in excess of 10,000 hours.

Heater voltage 6.3V
Heater current 300mA
Typical operating conditions
Anode voltage 210V
Screen voltage 120V
Anode current 10mA
Screen current 2.1mA
Mutual conductance 9mA/V
Anode impedance 500k ohms
Ampification factor 38


Pin Function
1 Screen grid
2 Control grid
3 Cathode
4 Heater
5 Heater
6 Anode
7 i/c
8 i/c
9 Suppressor grid and internal shield