S G BROWN AMPLIFIER, 1924

Known as the 'Brown Microphone Amplifier' it was initially designed to amplify telephone signals,although called a microphone amplifier it is not used with a microphone, this refers to the working mechanism which is purely mechanicle. In the 1920's a license was required for valve equipment, this unit cost half the fee. A wireless set or crystal receiver could be connected to these units and enough power could be produced to enhance the sound considerably. With a six volt battery to power the unit it would consume less power than an equivelent two valve system. In 1924 this model for valve sets cost £5.5s.0d.

A0312