- Item type
- Object
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "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.
- Object type
- Radio valve
- Dimensions
- Diameter: 55mm Height: 130mm Weight: 0.05kg
- Inventory No
- 24996
- Accession Number
- 2004-9/369
Description
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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