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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

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 -

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  23 Loud Speaking Telephone Type D Form C2   BTH Horn Speaker Type D Form C2. 
GB  27 VR3 Form CA    
GB  26/27 Portable Set Super Heterodyne B5  3 valve portable Superhet for headphones. Available in leather cloth finish for 20 ... 
GB  26/27 Radiola III B5  The cabinet with doors is similar to the RCA Radiola IV. RCA had planned an early Radio... 
GB  26/27 Portable Loud Speaker and Amplifier B6  Primarily designet for use with the Portable set, this can be used with any type of rec... 
GB  25 Six-Valve Receiver Super Heterodyne   Built-in Frame Aerial. Price including valves, HT- and LT-Batteries,enclosed Loud S... 
GB  24 Radiola-Bijou Type C Form B [late]   BBC-stamp; G.P.O. REG. No. 861.  BTH label on top. The name RADIOLA appeared ... 
GB  99/99 Dublette ID = 226047    
GB  29 YG 90723   78 rpm. Pickup BTH type YG. 
GB  20 Portable Wireless Receiver A_BTH  The "Portable Wireless Receiver" of B.T.H. is manufactured by "The Cox-Cavendish Electrica... 
GB  25 Supreme   BTH Supreme BBC Headphones; 
GB  27 3-Valve Resistor Receiver B8  Anode bend detector, plus two resistance-capacity-coupled LF valves. Wave range 200-650 an... 


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

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