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ID = 28662
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to ORA-B
First year 1923 ? 70 Years of Radiotubes and V.
First Source (s)
1922 : British Radio Valves - The Vintage Years, Thrower p.36

Base IS-1 (Interservice, UK 1918)
Filament Vf 3.8 Volts / If 0.65 Ampere / Direct / Battery =
Description Special fitting to allow higher frequencies. 
Dimensions (WHD)
incl. pins / tip
33 x 81 x mm / 1.30 x 3.19 x inch
ORA-B: Anonymous Australian Collector
Fin Stewart

ORA-B: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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