I have a smaller Motorola console with the same type amplifier. The bass speaker is probably a little larger. It also has the optional FM/AM tuner.
It's rather tricky, the way Motorola designed the connections. All you had to do is unplug the record changer, audio and power cable and plug it into the tuner and plug the tuner leads into the connectors that originally went to the changer. Five miniutes tops.