Vintage Radio Tuning Mechanism

Posted by barnoid Tue, 28 May 2013 23:40:14 GMT

This is how the tuning works on an early sixties Philips radiogram. As I turn the knob it rotates the black disk which has a spiral groove. The horizontal metal bar has a peg in the groove so it rises as the disk turns. Wires run from the bar to the cores of several inductors so that it pulls them up through the inductor as it raises, changing their inductance and the frequency of the circuit they are connected to.