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A new miniature encapsulated 3–transistor amplifier with full Ministry of Aviation type approval has been introduced by Amplivox Ltd., Beresford Avenue, Wembley, Middlesex. It is designed for the replacement of carbon microphones by high speech quality magnetic and noise‐cancelling units. The amplifier weighs about i 02., has a voltage gain of 50 db, and contains a surge limiting diode and an output control.

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