Nagra IV-S
The portable reel-to-reel that location sound crews built entire careers around.
Overview
There is no spec sheet for a Nagra IV-S in the sense that a hi-fi catalog would recognize. What exists is a stack of primary documents - a handful of period advertisements and the accumulated testimony of people who ran one on a sound stage. The IV-S is understood through its ecosystem as much as through its own circuitry, and the surviving documents reflect that. A 1974 Studio Sound notice (September 1974, p.70) described the IV-SJ's capability of recording and reproducing information with a 10:1 frequency multiplication or division by using the 38 cm/s and 3.8 cm/s tape speeds.
The period advertising tells a simpler story. A 1974 Studio Sound notice (February 1974, p.18) ran the IV-S alongside a standing offer to buy Nagra III's for cash. Nagra's own used market was active enough to advertise against. A 1979 Studio Sound survey (December 1979, p.62) listed the Nagra T-Audio, a four-channel instrument recorder built to the TRIG Intermediate band specification with twin capstan drive. It quoted wow and flutter figures of 0.035% at 15 in/s and 0.065% at 7½ in/s. Those numbers belong to the T-Audio, not the IV-S. A 1985 Mix Magazine advertisement (1985, p.37) promoted the Nagra IV-S TC with Time Code as a way to give music videos better quality sound with less time-consuming post work. It positioned the IV-S as the long-standing standard for motion picture sound recording. A 1986 Studio Sound piece (October 1986, p.24) framed Nagra Kudelski as having set standards "from location to studio" with the IV-S Time Code and T Audio Time Code machines, listing SMPTE/EBU 80 compatibility and applications spanning film/video dubbing, separate sound, sound following, and editing. That is a manufacturer's advertisement rather than an independent verdict.
The surviving documentation does not give production years, original pricing, serial ranges, common failure points, or current market values. Those things exist somewhere, but they are not in these sources, and filling them in from memory would be dishonest. What can be said is that the machine's reputation rests on integration. Its control voltages, output levels, and mechanical mounting were standardized enough that a third party could build a serious accessory around it and document the interface in exacting detail.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.