The antenna may be rotated from the “down” to the “upright” positions by turning control knob however, the rod extensions must be extended or retracted by hand outside the body. The antenna position is controlled by a knob located just above the center of windshield inside the body. In addition to the automatic tuning, a control knob permits manual selection of stations if desired. The number of stations on which the tuner will stop can be regulated by use of the sensitivity control knob on the receiver. The tuning mechanism is driven by a spring loaded mechanical motor which is stopped on station by a triggering circuit actuated by voltage developed from an incoming signal. The seeking operation is a uni-directional sweep of the broadcast band from low to high frequency with a nearly instantaneous return. The Selectronic radio receiver contains an automatic signal-seeking tuner by which the operator can change stations by merely depressing the single selector bar on the receiver, or the foot control switch on the toe panel. In addition to the push buttons, a control knob permits manual selection of other stations. The Sonomatic radio receiver has five push buttons for touch-tuning of five pre-selected stations. The 8-inch speaker is the permanent magnet type. The tuner assembly is of the 3-coil iron core permeability-tuned type. The radio receiver employs the superheterodyne circuit. The Selectronic radio installation also includes a foot control switch mounted on the toe panel to left of the brake pedal. The Buick Sonomatic and Selectronic radio installations consist of a receiver set with built-in speaker mounted at the center of the instrument panel and a 4-section antenna mounted just above the center of windshield. 11-6 1950 BUICK RADIO DESCRIPTION AND OPERATING INSTRUCTIONS
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