- Item type
- Object
- Provenance
- Presented by the Marconi Corporation.
- Primary inscriptions
- "D.E.Q. MARCONI / VALVE / B / PATENTED / MADE IN ENGLAND / PRODUCED FOR M.I.M.C.CO.LTD. / 204" printed on exterior surface of bulb.
- Object type
- Radio valve
- Dimensions
- Diameter: 27mm Height: 75mm Weight: 0.05kg
- Inventory No
- 29390
- Accession Number
- 2004-9/340
Description
Marconi Radio Valve Type DEQ (Dull Emitter Q), in thin glass envelope. With single wire filament running the length of the envelope and tensioned by a spring at end opposite the anode and grid brass supports. The anode and grid connections are on the envelope and pass to a shaped piece of glass rod that supports the electrodes. The grid helix can be clearly seen within envelope. A distinctive feature of DEQ valve is green band of paint around centre of envelope. Type DEQ valves had a very high impedance and primary function was as detector.
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