Heathkit was a famous kit manufacturer in the 1970s. Their catalog was long: it proposed everything from simple projects to advanced test equipment, color TV sets, Hi-Fi, and of course video games.
This kit (model GD-1380) was released in 1976. It plays the six games of the AY-3-8500 chip, and has several interesting features. First, it requires a Heathkit TV set to operate because of its composite output. Back in 1976, only monitors and hi-tech equipment had a composite input. To use this system, the user had to open his TV set in order to connect a few wires to its electronic circuits. This is the case with the Heathkit TV sets: the user manual explains how to connect the system to several TV sets released by Heathkit. The system has another interesting feature: the sound does not come from the system itself like most of the other PONG consoles, but comes from the TV set. The main reason for this is the direct connexion of the system to the TV set. Since the TV had to be open for connecting, why not connecting additional wires to the audio amplifier of the TV instead of using a speaker in the system ? Using the TV as audio output was not possible with regular systems which used a video modulator. Outputing the sound to the TV would have required additional circuits, hence a higher price of the systems. Here, the system benefits of a direct connexion to the TV set, hence the possibility of using the audio circuits of the TV without additional costs. A last thing: the blue electronic gun of the system is very funny, and the user manual is extremely detailed.