Name: | Cleartron Radio Ltd.; London (GB) |
Abbreviation: | cleartron |
Products: | Model types Tube manufacturer |
Summary: |
Cleartron Radio Ltd. The firm of Cleartron Radio Ltd in the UK was a subsidiary of the US company Cleartron Vacuum Tube Co [1] & [3]. tHe tube factory was at 21 Cumberland St, Birmingham and operated from 1925 to 1927, making and asembling a number of tubes during these years [1] & [3]. Some tubes had completed bulbs imported from the US company and these were fitted with the British B4 base, or other bases appropriate for the tube type. |
History: |
[1] Keith Thrower, British Radio Valves, The Classic years: 1904-1925, p. 4, 46 & 47, 90 & 114 |
This manufacturer was suggested by Konrad Birkner † 12.08.2014.
Country | Year | Name | 1st Tube | Notes |
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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):
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Cleartron Radio Ltd
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Fin Stewart
15.Dec.14 |
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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 |
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