Do you know how to operate your turntable? This is a manual for an early series of Zenith solid state radios, models D924, D921 and D922. I assuming this dates to the mid 1960s. Zenith's last tube consoles were phased out in 1965, so it's likely between 1965 and 1975. It's difficult to be certain.. these units aren't considered "classic" by anyone.
Record players of this era still used a high tracking weight which was a compromise between the needs of 78s and vinyl records. But it's an interesting doc filled with retro diagrams, and nwo comic sounding descriptions of FM radio and 4 speed turntables.
You can download it