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Marconi Radio Valve Type MH4, by Marconi Company, London, 1930s

Inventory Number: 24996

24996-1t 24996-2t

Date: 1930s

Maker Details: Signed by Marconi-Osram Valves.

Inscription: "MADE IN ENGLAND / MH4 / PATENTED" printed on top of exterior surface of bulb. "Marconi / Valve / B.V.A." printed on label stuck on exterior surface of bulb. "MOV" printed on underside of base.

Size: 130 mm in overall length (including base pins)

Materials: Glass, plastic?, nickel, steel, assorted metals.


Marconi Amplifier Triode Radio Valve (or Tube) Type MH4 with partially blackened glass balloon, probably due to use. With polished black plastic? base and five nickel-plated steel base pins.

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