Virtual Valve Museum
Virtual Valve Museum | Search: (use * for wildcard)
About the museumMuseum exhibitsSupportersDocumentsLinks to other sites, suppliers etc.

Brimar 9D6 / CV131 / W77 HF vari-µ pentode

Size This valve measures 54x17mm and has a B7G base

See also CV2023 which is a modified version.

Heater voltage 6.3V
Heater current 0.2A
Max operating anode voltage 300V
Max anode voltage (Ia=0) 500V
Max operating screen voltage 300V
Max anode dissipation 3W
Max screen dissipation 0.7W
Mutual conductance
(Va=250; Vg2=200; Vg1=-2.5)


Pin Function
1 Control grid
2 Cathode
3 Heater
4 Heater
5 Anode
6 Suppressor grid + shield
7 Screen grid



CV131/W77 markings

This file was last modified 11:39:46, Thursday February 24, 2022