Link leads to a .pdf format site with lots of pictures of products from the golden era of quadraphonic goodies. Mainstream stuff with the rare super-quality components absent.
https://worldradiohistory.com/Archive-Catalogs/Consumer/Olson Radio-1974-Catalog.pdf
https://worldradiohistory.com/Archive-Catalogs/Consumer/Olson Radio-1974-Catalog.pdf