Catalogue
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Marconi Radio Valve Type MH4, by Marconi Company, England, c. 1931
Inventory Number: 20104
Date: c. 1931
Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.
Inscription: "MARCONI / MARCONI'S / WIRELESS TELEGRAPH CO LTD MWTCL [LOGO]" printed on sticker attached to lower exterior surface of cage. See Documents for other inscriptions.
Size: 115 mm in overall length (including base pins)
Materials: Cooper, steel, plastic?, assorted metals.
Notes:
Marconi Catkin Radio Valve Type MH4 with large copper cage around valve with polished black plastic? base and cap, and five steel base pins. Very unusual style of valve.
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