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The Acorn valves were designed to allow use at UHF frequencies. The all glass construction was difficult to mass produce and pushing the leads into the spring clips of the base often caused the seals to crack.
Articles
Acorn Valves a UHF development from the USA.
An acorn data-sheet.
Acorn Valves.
Acorn Antiques, Stef Niewiadomski BVWS Bulletin, Autumn, 2005.
Index of Exhibits
Acorn Valves
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