Check out this link for more info [link]http://www.heathkit-museum.com[/link]

Basically, there were electronics kits that were built by the home user. The kit would include all the parts, circuit boards, and instructions needed to build the item. The had kits for tons of stuff but some of the highlights would be stereo equipment, televisions, and a 5 channel RC transmitter and receiver. They weren't for the light of heart though because they did require a pretty good understanding of electronics and good building techniques. If you couldn't solder well you could forget building a Heathkit.

Hope this helps

Ken