Philips amplifier system

Philips amplifier set for optical and magnetic sound track with four independent preamplifier channels. A magnetic sound track reader, a so-called four-channel penthouse reader, was installed on the machines. The amplifier set was used at Gamla Bíó from 1960–1970. When it came time to show Ben-Hur (1959), the theater's sound system was replaced. The new system could play in stereo or SVA (Stereo Variable Area), with sound coming from the right, left, and center, along with effects speakers in the auditorium. This technology was considered a revolution in sound. The amplifier system is a predecessor to Dolby Stereo, as Dolby is based on the same principles of sound from left, center, right, and surround speakers. A different technology was used at the New Bio, where they used a Klangfilm amplifier.