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CV2901 / EF86 low hum, low microphony pentode

Size This valve measures 55x19mm overall and has a B9A base.

See also CV4085 and CV4086 which are based on this valve.

Heater voltage 6.3V
Heater current 200mA
Max anode voltage (Ia=0) 550V
Max screen voltage (Ig2=0) 550V
Max anode dissipation 1W
Max screen dissipation 200mW
Max DC anode voltage 300V
Max DC screen voltage 300V
Max cathode current 6mA
Anode current * 3mA
Screen current * 0.55mA
Mutual conductance * 2mA/V
Anode impedance * 2.5M ohms
Inner amplification factor 38
Max heater cathode voltage 50V
Capacitances (without metal screen)
Cag max 0.05pF
Cge 4.3pF
Cae 5.1pF

*: At Va=250, Vg2=140, Vg1=-2.


Pin Function
1 Screen grid
2 Shield
3 Cathode
4 Heater
5 Heater
6 Anode
7 Shield
8 Suppressor grid
9 Control grid

Donated by Chris Colebrook


This file was last modified 23:10:25, Wednesday February 23, 2022