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History of the manufacturer  

Cleartron Radio Ltd.; London

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Name: Cleartron Radio Ltd.; London    (GB)  
Abbreviation: cleartron
Products: Model types Tube manufacturer
Summary:

Cleartron Radio Ltd.
1 Charing Cross Rd., London SW1

Cleartron Radio Ltd., the UK subsidiary of the American Cleartron Vacuum Tube Company, operated a vacuum tube factory at 21 Cumberland Street in Birmingham from 1925 to 1927 [1][3]. 
During this period, the company manufactured and assembled tubes, some of which used imported pre-made bulbs from its US parent company, fitted with British B4 bases or other bases suited to the tube type.
History:

[1] Keith Thrower, British Radio Valves, The Classic years: 1904-1925, p. 4, 46 & 47, 90 & 114
[2] Keith Thrower, History of the British Radio Valve to 1940, p. 5 & 6
[3] Keith Thrower, British Radio Valves, The Classic Years: 1926-1946, p. 243 and Supplement p.17
[4] G.Tyne, "Saga of the Vacuum Tube" p.391-392

This manufacturer was suggested by Konrad Birkner † 12.08.2014.

Some models:
Country Year Name 1st Tube Notes
GB  26 Sir Oliver Lodge N Circuit Receiver   plug-in coils; 
GB  99 Doublet ID=245625   Horn loudspeaker by Cleartron London 
GB  26 Loudspeaker       
[rmxhdet-en]

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

Wireless World September 1925tbn_cleartron_ww925.jpg
Wireless World July 21, 1926tbn_cleartron_wireless_world_july_1926.jpg
Amateur Wireless 5th October 1929 Page 491tbn_gb_cleartron_anzeige_1929.jpg
Forum contributions about this manufacturer/brand
Cleartron Radio Ltd.; London
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Cleartron Radio Ltd
Fin Stewart
15.Dec.14 		  1
Cleartron Radio Ltd 

The Cleartron Radio Ltd offices were located at 1 Charing Cross Road, London SW1 and the factory was at 21 Cumberland St Birmingham. The company was a subsidiary of the New York based Cleartron Vacuum Tube Company. In 1925, four tubes were manufactured (CT08, CT15, CT25 and CT25B). Other tubes followed while the Birmingham factory was in operation and some tubes were assembled from US made parts. An unusual feature of Cleartron tubes is that the exhaust "tip" on all tubes, both US and British made, was flattened slightly during manufacture. The reason for this is unknown
 
Cleartron Radio Ltd.; London
End of forum contributions about this manufacturer/brand
  
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