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CV2231 pulse modulator pentode

Size This valve measures 78x20mm overall and has a B9A base.


Heater voltage 6.3V
Heater current 1.2A
Max anode operating voltage (DC) 600V
Max anode voltage (shunt stabiliser) 6kV
Max anode voltage (pulse)
(max duration 15% of one cycle with a max of 15µs)
Max screen voltage (DC) 600V
Max anode dissipation 12.0W
Max screen dissipation 3.0W
Max cathode current (DC) 120mA
Max cathode current (peak) 2.5A
Max heater-cathode RMS voltage 230V
Mutual conductance (Va=Vg2=150V, Ia=50mA) 8.5mA/V
Inner amplification factor 8.5
C in 13.5pF
C out 12.0pF
Ca,g1 0.40pF


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