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Marconi Radio Valve Type MH4, by Marconi Company, England, c. 1931
Inventory Number: 20104
Number of documents: 2
Document Type: Miscellaneous Note
Document Heading: Inscription
Text:
"PATENTED MADE IN ENGLAND" inscribed along top of exterior surface of cage. "MH4" inscribed along botton of exterior surface of cage.
Document Type: Miscellaneous Note
Document Heading: Technical Details
Text:
The Catkin valve was introduced in 1931 and its revolutionary construction reduced inter electrode capacitances. Beneath the screening shell is a small diameter copper/glass envelope (Type MH4 valve).
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