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Osram-GEC Radio Valve Type R4, by Osram-GEC, England, c. 1916

Inventory Number: 59017

59017-1t 59017-2t

Date: c. 1916

Maker Details: Signed by Osram G.E.C.

Inscription: "OSRAM / G.E.C. / MADE IN / ENGLAND / R.4" stamped on one side of exterior surface of bulb. "VALVE / WIRELESS RECEIVING NO. R.4 / PATT. NO.4411 / A.7953" stamped on other side of exterior surface of bulb.

Size: 75 mm in overall height (excluding base)

Materials: Teak?, glass, brass, tungsten, assorted metals.

Other Given Number(s): Christie's 203.


Osram-GEC Soft Triode Radio Valve Type R4, with bulb-shaped glass exterior, brass fittings and a teak? mounting. With cylindrical anode threaded by helical grid with an interior single-strand wire filament, made of tungsten. In use filament would burn brightly similarly to a light bulb.

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