Cover illustration from a ’30s Marconi Valves data booklet.
In this issue
- Another Curve Tracer
- The History of Eimac
- German FuG 25a “Erstling” IFF Transponder of WWII
- Weird Tube of the Month: The Burgess Radiovisor Bridge
- Review: Aidade do Electron – 100 Anos de Progresso na Electronica
- Mercury: The New Asbestos
- Chemical Highlights of Tube Manufacture
- A British Thomson-Houston Audion – Not in Tyne
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