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Nagra is a generic term referring to any of the series of professional audio recorders produced by Kudelski S.A., based in Geneva, Switzerland.

Nagra-brand tape recorders were the de-facto standard sound recording systems for motion picture and single-camera television production until the 1990s. Their physical appearance, with the single transport selector and large reel-to-reel tape deck are still the stereotypical image most people have of a professional tape recorder.

The analogue Nagra recorders have a reputation for extreme ruggedness and reliability, essentially being the "swiss watch" of audio tape recorders. Their cases are highly durable, and every component, from the transport rollers to the gain pots have the feel of bulletproof engineering. The feature that gave Nagra the edge in quality and film use was Stepan Kudelski's development of the Neo-Pilottone system, where synchronization data could be recorded on the tape in the middle of the audio track, but without crosstalk onto the program recording.

Nagra recorders are identified by their model number, which indicate their technological generation and features:

In addition to these field recorders, Kudelski S.A. produced a studio recorder called the Nagra T-Audio, designed mainly for use in telecines for transferring dailies. All analogue Nagras recorded on 1/4" tape.

The Nagra IV-STC was the standard until the mid-1990s, when DAT recorders became reliable enough to use in the field. In response, Kudelski produced two digital recorders to compete:

Aside from its line of motion picture sound recorders, Kudelski S.A. originally produced and continues to produce high-quality recorders for electronic news gathering, radio, and music recording.