The following article discusses amateur builds of a few prewar TV receivers. The article gives links to various build instructions in the magazines of the time. Most of these receivers used 1 or 2 inch Oscilloscope CRTs available in the prewar time period
https://soldersmoke.blogspot.com/202...arly-1940.html
Also there is a book called Look and Listen which has the complete build instructions for a Andrea prewar set. An image of the book at:
http://www.tvhistory.tv/1939_Andrea_Assembly_Manual.JPG