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History of the manufacturer  

BTH (B.T.H.), British Thomson-Houston Co, Ltd.

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Name: BTH (B.T.H.), British Thomson-Houston Co, Ltd.    (GB)  
Abbreviation: bth
Products: Model types Tube manufacturer
Summary:

B.T.H., British Thomson-Houston Co, Ltd., Crown House, Aldwych, London WC 2.

Products: Crystal sets, valve radios, Loudspeakers, valves.
All the valves were produced at the Mazda Lamp Works in Rugby.  B.T.H. acquired Ediswan in 1928-1929 and Ediswan offered no new models after that but continued the Power Pentode receiver until 1932.

Production: 1916 -
History:

In 1928 BTH amalgamated with Metrovick and Edison Swan to form Associated Electrical Industries Ltd.(AEI).


Some models:
Country Year Name 1st Tube Notes
GB  22 Type C Form A [early]   BBC/PMG stamp; GPO No.106; Crystal changeover switch permit to select one of two independa... 
GB  23 Valve-Crystal Receiver "Radiola1" Type VC B5  BBC/PMG stamp; GPO No.0373; HF-stage and twin crystal det.; Long Wave by plug-in coil. ... 
GB  23 Type C Form A Radiola Form A [late]   BBC/PMG stamp; GPO No.106; Crystal changeover switch permit to select one of two independa... 
GB  23–25 BTH Bijou Type C, Form B [early]   BBC/PMG stamp; GPO No.861; Height with lid open 160 mm. Later models got the name RADIO... 
GB  99 doublet 76502   MW/LW version; 
GB  23 VR2   plug-in coils; 
GB  99 doublet id= 76209   BBC/PMG stamp, GPO No.861; 
GB  25/26 BTH Bijou Type C, Form BB   Dial in metres for BC and LW. Automatic band switching. 
GB  25 VA1 Form AB   BBC/EBM stamp. 
GB  25 VR2 Form BA   Plug in tuning units. BBC/EBM stamp. Matching amplifiers for loudspeaker use: VA1 or VA2. 
GB  25 VA2   BBC/EBM stamp. 
GB  27 VR3 Form A    

[rmxhdet-en]

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

tbn_gb_bth_firma.jpg
Logo in BTH Speaker, ~ 1930.tbn_gb_bht_logo_1930.jpg
Dieses Bild ist auch beim Modell ID =77375 - Thanks for Mr.István Gulyás, Hungary, and Első Zalai Rádiómúzeum Alapítvány, First Zala County Radio Museum Foundation.tbn_gb_bth_vr3formca_data1.jpg
Undated, c. 1925tbn_bth_undated_c._1925.jpg

  
rmXorg