Tefifon

thumb|Tefifon portable radio with cartridge player (the Tefi "Holiday Super II")The Tefifon is an audio playback format, developed and manufactured in Germany, that utilizes cartridges loaded with an endlessly looped reel of plastic tape. It is somewhat similar to the later 4-track and 8-track magnetic audio tape cartridges, but with grooves engraved into the tape, like a phonograph record. The grooves were engraved in a helical fashion across the width of the tape, in a manner similar to Dictaphone's Dictabelt format. The grooves are read with a stylus and amplified pickup in the player's transport. A Tefifon cartridge, known as a "Tefi", can hold up to four hours of music; therefore, most releases for the format are usually compilations of popular hits or dance music, operas, and operettas. Tefifon players were not sold by television and radio dealers in Germany, but rather sold directly by special sales outlets affiliated with Tefi (the manufacturer of the format).

==History== ===1930s=== The Tefifon format was developed by the German entrepreneur Dr. and his "Tefi" company in 1936. A few years earlier, devices using phonographic grooved tape like the Tefifon were produced by Tefi for special purposes, like the military, and were designed for voice recording. Prior to the Tefifon's introduction, Tefi had introduced a device capable of recording and playback under the name "Tefiphon" (note the alternate spelling) and another device only capable of playback under the name "Teficord". Both use loose tape, unlike the cartridge-loaded tape of the Tefifon.