細節
An Audio Frequency Power Amplifier
by Sterling Telephone & Electric Co. Ltd., London, with two valves mounted horizontally on central binacle, first and second stage switches and output controls for each stage, in walnut case with hinged lid, BBC transfer and hinged endflaps for connecting wires -- 14in. (35.5cm.) wide, circa 1923
by Sterling Telephone & Electric Co. Ltd., London, with two valves mounted horizontally on central binacle, first and second stage switches and output controls for each stage, in walnut case with hinged lid, BBC transfer and hinged endflaps for connecting wires -- 14in. (35.5cm.) wide, circa 1923