Songs On The Radio
If a driver of a standard automobile were to see a NASCAR race car, he could tell it was an automobile. However, he would notice many things that were different on it than what he had at home. A similar comparison could be made with turntables. Someone with a good home turntable would know what a broadcast turntable did. He might even be able to figure out how to operate it, but he would recognize that a broadcast turntable was a different animal from a home turntable.
The following video shows what an old broadcast turntable looks like. Before you play the video, look at the picture. The turntable has a 45 on it. Looking closely, you can see that the 45 is in a recessed area of the platter. That recess also includes a large spindle for 45’s in the center. The raised outer area of the platter is where an album would rest. Above the recessed 45 spindle is the standard spindle for albums.
The platters were very heavy and were driven by a rubber roller that transferred power from a high-torque motor. That motor allowed the turntable to come up to speed in about one-quarter of a turn at 33, one-third of a turn at 45. The shaft from the motor had three levels on it to provide the three different speeds. The speed control lever also had one or more neutral positions available that allowed the platter to be turned by hand.
Unlike the way the person who made the video would cue a record, I would put the turntable in to neutral. That allowed me to quickly cue up a 45 — literally in less than five seconds once the 45 was on the platter.