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Cassette tapes are made of a polyester-type plastic film with a magnetic coating. The original magnetic material was based on gamma ferric oxide (Fe 2 O 3). Circa 1970, 3M Company developed a cobalt volume-doping process combined with a double-coating technique to enhance overall tape output levels.
Real cassette tapes invariably deviate from the references and require fine tuning of bias; recording a tape with improper bias increases distortion and alters frequency response. [26] A 1990 comparative test of 35 Type I tapes showed that their optimal bias levels were within 1 dB of the Type I reference, while Type IV tapes deviated from the ...
The thickest tape normally used in cassettes is about 16-18 μm in thickness, and is used in C60 cassettes and in shorter lengths such as the C46. As the standard tape speed for a compact cassette is 1 + 7 ⁄ 8 ips (4.75 cm/s) and a C60 cassette records 30 minutes per side, a C60 cassette in theory holds 281 + 1 ⁄ 4 ft (85.73 m) of tape. In ...
Types and brand. history starts as "war of the cartidges and reels": RCA Victor Tape Cartridge (later renamed sound tape cartridge, snap load cartridge, quick load cartridge; used 4 track system), minnesota mining andmanufacturing company's scotch quick load cartridge (similar to RCA's) and also their own cartridge system (quite different than RCA's), Bernard Casino's echo matic self threading ...
The original standard microcassette, the MC60, gives 30 minutes recording per side at its standard speed of 2.4 cm/s, and double that duration at 1.2 cm/s; an MC90, giving 45 minutes per side @ 2.4 cm/s, is also available from a few manufacturers.
Cassette tapes are not vulnerable to scratching from handling (though the exposed magnetic tape is vulnerable to stretching from poking), and play from where they were last stopped (though some modern MP3 players offer savestating electronically). Cassette tapes can also be recorded multiple times (though some solid-state digital recorders are ...
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