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CV139 grounded-grid triode

Size This valve measures 50x17mm approx, and has a B7G base


Heater voltage  6.3V
Heater current  0.3A
Max anode voltage  250V
Max anode dissipation Without can 2.5W
Max mean cathode current  15mA
Mutual conductance At Va=250V;
Vg=-1.5V; Ia=10mA
Amplification factor 100
Min grid voltage to be available
to ensure cut-off to a slope of 100µA/V  
Max h-k voltage  150V
Max g-k voltage  100V
Max operating frequency  250MHz
Ca-ch At 1MHz with close
fitting metal can
connected to grid
Cg-ch 5.1pF
Chc 8.6pF


Pin Function
1 Grid
2 Cathode
3 Heater
4 Heater
5 Cathode
6 Grid
7 Anode