A 100 Year Old Solid-state Amp - The Brown Microphone Amplifier

In 1923 the S. G Brown company of London introduced the "Crystavox", an all but forgotten loudspeaker with an integrated carbon microphone amplifier. This type of amplifier was invented at Bell Telephone Labs in 1904 for use in the Bell system on long distance telephone lines.

Decades before the invention of the transistor and without any vacuum tubes the "Crystavox" allowed a crystal set to be heard throughout a room. In this presentation Robert Lozier discusses his restoration of this "Crystavox" and demonstrates its surprising performance.

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