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STC CV499 / 5B/256M beam tetrode

Size This valve measures 89x30mm overall and has a B8G base.


Heater voltage 6.3V
Heater current 300mA
Max anode voltage 600V
Max screen voltage 300V
Max anode dissipation 25W
Max anode current 200mA
Max screen dissipation 4.5W
Mutual conductance * 6.0mA/V
Inner amplification factor * 9.0
Max frequency for above ratings 60MHz
Cag 0.13pF
Cge 12.0pF
Cae 8.5pF

*: At Va=300, Vg2=250, Ia=72mA


Pin Function
1 Heater
2 Anode
3 Screen grid
4 Internal shield
5 Control grid
6 Control grid
7 Cathode and beam plates
8 Heater