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1920s Marconiphone NB1 Single Stage Voice Amplifier Wk 1743
This is an early version of the crystal set radio / wireless 1920s Marconiphone NB1 Single Stage Voice Amplifier Wk 1743. The sockets for the 'phones and battery are on the rear of the wood case. I think this is a type NB1 amplifier used with a Marconiphone V2 Radio Receiver.
In good untested and original condition, the voice amplifier comes with two 2-pin sockets and a handset. It is sold as a collectible for display only. The external wood has a few blemishes and some damage on the rear base.
The labels give the following information:-
BBC approval by the Post Master General
GPO Registered No. 3285
Marconiphone Co. Ltd London
Marconiphone Voice Amplifier Single Stage
Instrument Number Wk 1743
The B.B.C., Marconiphone, and G Marconi transfers are still intact.
In the early days of radio broadcasting an amplifier was required for magnifying the music or speech received by the detector sufficiently to operate a loud speaker. This is a rare survivor from that period and perfect for radio history aficionados!
Please click on the following link for more vintage radio.
The images have been taken with and without flash hence the differences in colour.
