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This book is a detailed history of the valve and its development in the UK from 1904 to 1925.
With 148 pages and many black and white illustrations.
Available from the publishers
Speedwell
4 Mapledene, Caversham, Reading RG4 7DQ
0118 947 4813
ISBN 0 9537166 0 0
£13.50 UK, £15.00 Europe,
and
£16.00 Outside Europe
The book provides a comprehensive cover of early British radio valves.
Background to the manufacturers and suppliers
Fleming diodes
Marconi-Round valves
Bright emitters
Dull emitters
Four-electrode valves
Low and high power transmitting valves
Post Office valves for telephone repeaters and radio stations
Valves produced for the three Armed Services
Details of the various bases and other means for external connections
Data on 475 types including many rare items
Extensive references
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