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History of the manufacturer  

Brown S. G. Ltd.; London

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Name: Brown S. G. Ltd.; London    (GB)  
Abbreviation: brown

S.G. Brown Ltd., Victoria Rd., North Acton, London W3.


Some models:
Country Year Name 1st Tube Notes
GB  24 H 1 [new improved curved horn]   Aluminium horn, wooden base, impedance 120 or 2000 or 4000 ohms, Brown reed driver, alu... 
GB  23–25 Microphone Amplifier Type C   To drive several pairs of headphones from a Crystal receiver; Mechanical amplifier: Magnet... 
GB  25 Q   Mahogany flare and polished aluminium horn, mounted by a model of a bluebird. Impedance 40... 
GB  25–27 Disc 1   Electromagnetic speaker. Ø 15 inch, height: 19 inch. 
GB  25 H4   Hauteur: 25.5 cm. In "Le Guide du Coll.Biraud/Foster 2" Jahrgang 1926. HP électromagnétiqu... 
GB  25 H3   HP électromagnétique. 
GB  23 Microphone Amplifier Type V   to drive a loudspeaker from a 1-valve rec.; Mechanical amplifier: Magnet system driving... 
GB  23 Junior Wireless Set [early]    
GB  23 Ideal Wireless Set    
GB  27 Junior Wireless Set [late]   uses the mechan.1-stage Microphone Amplifier. Provision for LW coil. 
GB  27/28 Horn Speaker Type E1 Standard   Square cast metal base on four feet. Horn type HQ, new base. The name in "Le Guide du ... 
GB  25 HQ   Round wooden base. 


Further details for this manufacturer by the members (rmfiorg):

Thanks for Első Zalai Rádiómúzeum Alapítvány, First Zala County Radio Museum Foundation Hungary (
Thanks for technical assistance Első Zalai Rádiómúzeum Alapítvány (, First Zala County Radio Museum Foundation, Hungary, Zalaegerszeg.tbn_gb_brown_powerp_37_logo_1926.jpg
Sidney George Brown, F.R.S. Engineer, Inventor, founder of S. G. Brown, Limited by Ian L. Sanders.tbn_gb_sg_brown_ian_l_sanders.jpg