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CV785 / 1T4 variable-µ HF pentode

Size This valve measures 52x17mm overall and has a B7G base.


Filament voltage 1.4V
Filament current 50mA
Max anode voltage 100V
Max screen voltage 75V
Mutual conductance * 0.9mA/V
Anode impedance * 500k ohms
Anode current * 3.5mA
Max cathode current 6.5mA
Capacitances (with close fitting shield conected to fil -ve)
Cag max 0.01pF
Cae 7.5pF
Cge 3.6pF
*: At Va=90, Vg2=67.5; Vg1=0


Pin Function
1 Filament -ve, suppressor grid, shield
2 Anode
3 Screen grid
4 n/c
5 Filament -ve, suppressor grid, shield
6 Control grid
7 Filament +ve

This file was last modified 23:10:37, Wednesday February 23, 2022