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ID = 8253
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  High-vacuum Rectifier 
Identical to U9
First year 1928 -- Original prospect or advert Listed in the Marconi catalog No. 520, Sept. 1928
First Source (s)
1930 : 70 Years of Radiotubes and V.

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament Vf 4 Volts / If 1 Ampere / Direct

This was one of the first British Rectifier to have an oxide-coated filament. 250V, 75mA.
Listed in the Marconi catalog No. 520, Sept. 1928.

Literature Taschenbuch zum Röhren-Codex 1948/49   
70 Years of Radiotubes and V.   
- - Manufacturers Literature
Patrice Zeissloff

U9: Manufacturer's Literature
Emilio Ciardiello

Usage in Models 5= 1929

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

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