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VR28 / 10E/8399 tetrode

Size This valve measures 126x40mm overall and has a B4 base.


Filament voltage 2V
Filament current 200mA
Max anode voltage 150V
Max screen voltage 80V
Mutual conductance (A) 1.6mA/V
Mutual conductance (B) 0.1mA/V
Anode impedance (A) 110k ohms

(A): At Va=150, Vg2=60, Vg1=0.

(B): At Va=150, Vg2=60, Vg1=-15.

Pin Function
1 Screen grid
2 Control grid
3 Filament -veand metallising
4 Filament +ve
TC Anode

This file was last modified 15:12:25, Tuesday September 02, 2014