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CV3998 wideband amplifier pentode

Size This valve measures 44x19mm overall and has a B9A base.


Heater voltage 6.3V
Heater current 300mA
Max anode voltage (Ia=0) 400V
Max operating anode voltage 210V
Max anode dissipation 3W
Max screen voltage (Ig2=0) 400V
Max operating screen voltage 175V
Max screen dissipation 900mW
Max control grid -ve voltage 50V
Max peak control grid -ve voltage 100V
Max cathode current 25mA
Max bulb temperature 155C
Mutual conductance (Va=180, Vg2=150, Ia=13mA) 16.5mA/V
Capacitances (with shield)
Cag1 max 0.03pF
Cin 7.9pF
Cout 2.9pF


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



This file was last modified 23:10:27, Wednesday February 23, 2022