Fidelipac (NAB cartridge). Introduced in 1959 by Collins Radio at the 1959 NAB Convention. The cart tape format was designed for use by radio broadcasters to play commercials, bumpers and announcements. It will be used until the late 1990s and is on the direct path to the first popular consumer tape format. It was originally a 1/4-inch-wide (6.4 mm) audio recording tape, two-track format at 7.5 ips. Fidelipac cartridge was later adapted by Earl "Madman" Muntz in 1962 for hisStereo-Pak cartridge system (run at 3.75 ips). Muntz also sold a library of 3000 titles licensed from 40 record companies. In the 1960s, Muntz sold about half of the 700,000 Fidelipac-type players