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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

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

Mentioned in Tyne's "Saga of the Vacuum Tube" on p.391-392.

The firm of Cleartron Radio Ltd in the UK was a subsidiary of the US company Cleartron Vacuum Tube. The tube factory was at 21 Cumberland St Birmingham and operated from 1925 to 1927, making and assembling a number of tubes during these years. Some tubes had completed bulbs imported from the US company and these were fitted with the British B4 bases or other bases as appropriate for the tube type.


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       


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

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