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Marconi Radio Valve Type DEQ, by Marconi Company, England, c. 1923

Inventory Number: 29390

29390-2t 29390-1t

Date: c. 1923

Maker Details: Signed by Marconi Valves.

Inscription: "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.

Size: 70 mm in overall length

Materials: Glass, steel, assorted metals.


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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