The Wireless-Set-No19 Group
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Frequency Meter T 74, 20 Mc/s - 280 Mc/s.
The T 74 is designed to cover 20-280 Mc/s with battery power. It was made by Telemechanics Ltd, of Hythe, Southampton. Date of manufacture is unknown, but I would estimate the 1950s. The meter uses a 1MHz crystal in a B7G envelope, rather than the large US Signal Corps model. The calibration booklet and operating instructions are virtually identical to the BC-221 series and a circuit diagram is screen-printed onto a metal plate inside the front lid.