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CV138 HF pentode

CV138 This valve measures 54x17mm and has a B7G base.

See also CV2195 which is a selected CV138, and CV2001 which is a modified CV2195.

Heater voltage 6.3V
Heater current 0.3A
Max anode voltage (Ia=0) 550V
Max screen voltage (Ia=0) 450V
Max operating anode voltage 300V
Max operating screen voltage 300V
Max anode dissipation 3W
Max screen dissipation 0.9W
Mutual conductance
(Va=Vg2=250V; Ia=10mA; Vg1=-2V)


Pin Function
1 G1
2 K
3 H
4 H
5 A
6 G3 + s
7 G2



The valve below is marked CV2000 and EF91. The CV2000 is incorrect as that particular valve is wire ended. See CV2000.

CV2000/EF91 (incorrect spec)

This file was last modified 13:52:49, Thursday February 24, 2022