pulley system in stereo?

Question

in the Technics SA-104 stereo receiver, there is a system of little spinning things and string on pulleys that makes up the tuning system. how does it all go together?

Answer 1

To change the frequencies, analog stereos used "comb" capacitor (I think). A layer of thin metal plates was fixed and another layer of metal plates could move in/out to interleave between the first.

This was part of a circuit that changed the frequency. The Pulley arrangement was so the user could turn a frequency knob on the front of the unit but cause the plates to move in/out to change the station.