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CV2128 triode/heptode

Size This valve measures 65x19mm overall and has a B9A base.


Heater voltage 6.3V
Heater current 300mA
Heptode section
Max anode voltage (Ia=0) 600V
Max anode voltage 330V
Max anode dissipation 1.9W
Max screen voltage (Ia=0) 600V
Max screen voltage (Ia=1mA) 330V
Max screen voltage 140V
Max screen dissipation 1.1W
Mutual conductance (Va=250; Vg2=100; Ia=6.5ma) 2.4mA/V
Triode section
Max anode voltage (Ia=0) 600V
Max anode voltage 275V
Max anode dissipation 0.9W
Mutual conductance (Va=100; Ia=13.5mA) 3.7mA/V
Cin (heptode) 4.8pF
Cout (heptode) 7.9pF
Cag1 max (heptode) 0.01pF
Cin (triode) 2.7pF
Cout (triode) 2.3pF
Cag (triode) 1.0pF
Cg3 - rest (heptode) 6.0pF
Cg1-g3 max (heptode) 0.3pF
Cg1-(g3+g) max 0.45pF


Pin Function
1 Heptode G2 and G4
2 Heptode G1
3 Cathode, shield and Heptode G5
4 Heater
5 Heater
6 Heptode anode
7 Heptode G3
8 Triode anode
9 Triode grid