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GECoPHONE crystal detector set No. 2, model BC1501, by GEC c. 1922, in mahogany cabinet with lift up lid. This set is far less common than the No. 1 set. It has stepped inductance, variometer and variable capacitor tuning, an open-type detector, the Loading Coil shorting link (sometimes missing) and a bracket on the lid with one spare detector mount. The set also includes a very useful refinement to aid setting the detector. When the button in the centre of the panel is pressed, a little buzzer emits weak radio signals that will cause a sound in the headphones when the detector is properly adjusted.