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ID = 28660
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to ORA
First year 1922 ? 70 Years of Radiotubes and V.
First Source (s)
1922 : British Radio Valves - The Vintage Years, Thrower p.37

Base Europe 4-Pin (A, 4A, B4, since 1914)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =

see ORA-A or ORA-B or DF_ORA or One_Volt_ORA

Dimensions (WHD)
incl. pins / tip
25 x 97 x 28 mm / 0.98 x 3.82 x 1.10 inch
Weight 40 g / 1.41 oz
Tube prices 1 Tube prices (visible for members only)
Peter den Boer

ORA: Fin Stewart
Fin Stewart


Usage in Models 2= 1922

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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