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VR28

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ID = 13137
       
Country:
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Screen-grid Tetrode   RF/IF-Stage   Controlling (mu) 
Identical to VR28 = CV1028 = 10E/8399 = 220VSG

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact with a cap.
Was used by Military and/or Government
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description

This is a variable mu tube.

 
Information source Babani, International Radio Tube Encyclopaedia   p. 156 & 157
-- Original-techn. papers.   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

220vsg_2.png VR28: Manufacturer's Literature
Emilio Ciardiello


Just Qvigstad

Collection of

 
vr28.jpg

VR28
 

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