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ORA-B

Information - Help 
ID = 28662
       
Country:
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
 
mullard_ora_b.jpg
ORA-B: Anonymous Australian Collector
Fin Stewart

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


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