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CV4508 short suppressor base pentode

Size This valve measures 30x10mm overall and has a B8D base.


This valve is based on the CV467.

Heater voltage 6.3V
Heater current 175mA
Max heater cathode voltage 100V
Max anode voltage, Ia=0 350V
Max screen voltage, Ig2=0 350V
Max operating anode voltage 190V
Max operating screen voltage 190V
Max anode dissipation 1W
Max screen dissipation 400mW
Max cathode current 12mA
Max vibration (100 hours max) 5g
Max vibration (10 mins max) 20g
Max shock (short duration) 500g
Max bulb temperature 165C
Min operating pressure 55mm Hg
Typical operating conditions (Va=Vg2=100, Vg1=-2, Vg3=0)
Anode current 3mA
Screen current 2.25mA
Mutual conductance 2.5mA/V
Inner amplification factor 34
Mutual conductance, G3 (Vg3=-2) 0.35mA/V
Capacitances (shielded)
Cin nom 4.2pF
Cout nom 3.1pF
Ca,g1 max 0.015pF
Ca,g3 max 3pF
Cg3,all nom 6.5pF




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

This file was last modified 23:10:30, Wednesday February 23, 2022