Inventory no. 50683 - Former Display Label
MARCONIPHONE NB 1 VOICE AMPLIFIER
Signed: "MARCONIPHONE 1 STAGE VOICE AMPLIFIER"
Polished mahogany box with lid (210mm x 200mm x 190mm). Designed to be used with the Marconiphone receivers. Single "DER" type 1.8 volt amplifying valve powered by a single dry battery secured in the base of this set, transformer, and adjustable rheostat with sliding contact for regulating the voltage of the valve's heating filament. Input lead, HT and LT battery leads, and loudspeaker connection. Serial no. S/K 1135.