Single-hole cassette

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The single-hole cassette was a concept of a hi-fi -suitable magnetic tape cassette from Philips for private end customers. The tape and tape speed were identical to the compact cassette that was given preference.

history

The Dutch company Philips has been working in its Vienna tape recorder factory, WIRAG , on the development of a HiFi-compatible cassette since 1961 . The Vienna factory had experience in the development and production of dictation systems with single-hole cassettes. On this basis, the new cassette was to be created as a high-quality tape system for home use. In addition to Philips, Grundig AG as well as the record companies associated with Philips, the Philips Phonographic Industry and the Deutsche Grammophon Gesellschaft were involved in the development. At the same time, a Belgian Philips team in Eindhoven developed a two-hole cassette called Pocket Recorder , which the Philips management decided on and which came onto the market as a compact cassette . Philips informed the cooperation partner Grundig late about the decision and in return made Grundig an offer to participate in the pocket recorder. Grundig was not happy about this and had the competing system DC-International developed on the basis of the construction drawings of the compact cassette , which was introduced in 1965 and taken off the market in 1967. In 1948 the development of the Minifon by Protona began, which also contained both tape rolls in the cassette.

technology

Like the compact cassette, the single-hole cassette used a tape only 3.81 mm (= 0.15 inch) wide at a belt speed of 1⅞ inch = 4.7625 cm per second, rounded: 4.75 cm / s. In order to wind the tape back into the cassette, the single-hole cassette received a ring gear with 8 teeth on its built-in tape reel for traction, which represents the one hole. The second winding roll is part of the tape device, so the cassette can only be removed when it has been completely rewound. The second roll of tape accommodated in the device increases the space required there, but makes the cassette more compact. The drive is a more complex construction, as the tape is only transported from the inserted cassette onto the winding roll in the drive.

These properties were not a disadvantage for data backup . With 3⅓ × wider tape, digital recording and changed traction, the concept of the single-hole cassette experienced another renaissance in the Linear Tape Open (LTO) after more than 35 years .

Web links

Individual evidence

  1. ↑ https://books.google.de/books?id=7eA7AAAAMAAJ&PA=385&PG=385
  2. ↑ Sebastian M. Krämer: Ear lining out of the jacket pocket - 50 years of compact cassette . In: SWR2 knowledge. Dossier on the broadcast of December 9, 2013