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CV4056 reliable video output pentode.

Size This valve measures 67x19mm overall and has a B9A base.

The CV Spec for CV4056 is for a valve with flying leads, not pins as the second example has. The pinned valve is the CV4055.

Heater voltage 6.3V
Heater current 750mA
Max anode voltage (Ia=0) 500V
Max screen voltage (Ig2=0) 500V
Max operating anode voltage 300V
Max operating screen voltage 300V
Max cathode current 65mA
Max peak cathode current 1.5A
Pentode connected
Max anode dissipation 12W
Max screen dissipation 2W
Anode current * 40mA
Screen current * 6mA
Mutual conductance * 11mA/V
Inner amplification factor * 26
C in (nom) 12.5pF
C out (nom) 5pF
Cag1 (max) 0.18pF
Triode connected (G2 to A, G3 to K)
Max anode dissipation 12.5W
Cathode current ** 46mA
Mutual conductance ** 13mA/V
Amplification factor 26
C in (nom) 6pF
C out (nom) 6pF
Ca, g1 (max) 6.5pF

*: At Va=Vg2=250V;Vg1=-4.5V; Vg3=0

**: At Va=Vg2=250V;Vg1=-4.5V; Vg3=0

Pin Function
1 i/c
2 Control grid
3 Cathode
4 Heater
5 Heater
6 n/c
7 Anode
8 Screen grid
9 Suppressor grid

Above: example with correct fly leads; below: a pinned example which is not correct

Fly-lead version donated by Bill Wagner

This file was last modified 23:10:29, Wednesday February 23, 2022