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ID = 38977
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  TWT, Travelling wave tube 
Identical to W4/2G

Filament Vf 6.3 Volts / If 0.73 Ampere
Description 7.0 to 8.5GHz, 15W output TWT. 36 to 47dB gain at 5W out. 3.1 to 3.7KV.
340 mm body lenght, 164 mm helix lenght. Flying leads.
Also marked as ITT England. 
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