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ID = 2479
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum   Audio Frequency 
Identical to DER = CV1642 = VT33_GPO
Similar Tubes
Other shape (e.g. bulb type):
First Source (s)
1922 : British Radio Valves - The Vintage Years, Thrower p.51,52
1925 : Saga of the Vacuum Tube, Tyne p.382
Predecessor Tubes LT1  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 1.8 Volts / If 0.35 Ampere / Direct / Battery =

Codex erroneously notes for the filament 2V, 0.1A; but the predecessor LT1 has the same filament data 1.8V, 0.35A.
Production of these tubes was maintained well into the 1930s with a modern shape glass and base but maintaining the horizontal cylindrical form. This was one of the last types with this early structure.

Tube prices 5 Tube prices (visible for members only)
Information source - - Manufacturers Literature   
Taschenbuch zum Röhren-Codex 1948/49   
DER: Fin Stewart collection
Fin Stewart

More ...
DER: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 1= 1922 ; 4= 1923? ; 2= 1923 ; 11= 1924 ; 5= 1925

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):23

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