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Radio Record, Volume II, Issue 6, 24 August 1928, Page 23

FEW valves die a natural death, at least few of those in the sets of radio enthusiasts. They are either short-circuited, dropped, or have something dropped ‘on them. A simple "valve safe" for valves not in use can be constructed ‘out of a few strips of corrugated cardboard, such as used for wrapping bottles, glued into a suitable box. Valves are more secure there than if left lying on the table or chair.