[Jersey Devil]

Jack

Tune the station with the manual tuning knob. Then reduce volume then loosen the desired push button by turning the button counterclockwise one turn.
Push the button in until it bottoms and release carefully. Tighten the button securely by turning it clockwise. Adjust volume. Adjust the remaining buttons.

Copied from page 186 section (b) Push Button of the Green Bible.

Not many AM stations remain these days.

Hope this helps,

Tom