Radio sets, the kind made by manufacturers as opposed to those put together by constructors or experimenters. Includes everything from tiny one-crystal receivers to giant consoles with speakers and record players built in, with dozens of tubes. At the low end it blends imperceptibly with the more complete experimenters' systems. You'll find headphones, separate loudspeakers, and other accessories there in the experimenters' section, too.

If you like old radio, you will like the e-book reprint of the 1922 Sears, Roebuck Electrical Goods and Radio Apparatus Catalog that Hidden Knowledge has published. Here's a writeup about it, with pictures. It's $2.99, free of DRM, and with all the pages rendered as images you can enlarge to see detail, and even print out. It's $2.99! Follow the link.