The Philips EE series of kits have been developed by Philips Electronics from the sixties (the EE5/EE10 and EE8/EE20) till the eighties (EE3000) in various forms, and became very popular in various European countries, notably Germany and the Netherlands. Initially these kits were used to promote Philips-produced electronic parts to hobbyists, but at the end of the sixties the focus shifted towards educational purposes: the kits were intended to interest teenagers in studying electronics. As a result the series gradually developed into the most advanced electronic experimentation kit type that has been available ever, with designs that include several superhet radios, an oscilloscope and even a TV! Tor Gjerde has presented a great and very detailed presentation of the complete range of series at his website that I highly recommend for a visit.
The Philips EE category - also accessible through the "I am a Maker" menu item on the top of this page - contains all of my contributions on this subject.