Catalogue
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Amplifier Type 91, by Marconi Company, London, c. 1918
Inventory Number: 39440
Date: c. 1918
Maker Details: Signed by Marconi's Wireless Telegraph Co. Ltd.
Inscription: "MARCONI'S WIRELESS / TELEGRAPH CO. LTD. / NO 215253 LONDON / TYPE NO 91" etched on upper surface.
Size: 285 x 225 x 145 mm (excluding knobs & valve)
Materials: Teak, nickel, glass, steel? bakelite.
Other Given Number(s): Christie's 140, Science Museum Loan 1960-261, 859 (white label).
Notes:
Amplifier Type 91, on teak case. With contacts for Type FE1 Valve, filament resistance, range switch (short wave, long wave and 600m), potentiometer knob (scale --10,0+10) and nickel-plated terminals (6V, 24V telephone).
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