The Technicolor Sound Movie Cartridge (also known as the TK Cassette) was an endless loop cartridge system for Super 8 film, introduced by Technicolor in 1968 to be played in the new 1000-A projector system that contained its own built in speaker. Being cartridge-based meant no threading of film, and was similar in concept to audio tape cartridge systems like 8-Track. At the end of the film, a notch indicated to the projector to switch off.
The Technicolor Sound Movie Cartridge is a larger (but incompatible) version of Technicolor’s earlier Magi-Cartridge.
The Sound Movie Cartridge could hold up to 30 minutes of colour sound film (600 foot in length) in the largest size cartridge, and some full-length movies were available on the format, split across up to four cartridges. The system also saw use in education and training, such as distributing information about new car models to dealers.
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