Good morning.  I ran into the following 1949 training video which covers a radio receiver & methodically explains its constituent parts: antenna, SuperHet, diodes.  I found it interesting and thought that you might too..

This is the URL:

BTW this is partially restored from a 1949 16mm film, originally produced by the International Civil Aviation Organization (ICAO), and distributed by the National Film Board of Canada.

Have a great day thinking about SuperHet history!

73,

Stephen (W2WF)