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• To record the history of the large format movies and the 70mm cinemas as remembered by the people who worked with the films. Both during making and during running the films in projection rooms and as the audience, looking at the curved screen.
in70mm.com, a unique internet based magazine, with articles about 70mm cinemas, 70mm people, 70mm films, 70mm sound, 70mm film credits, 70mm history and 70mm technology. Readers and fans of 70mm are always welcome to contribute.

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All-Purpose Sound Reproduction

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in70mm.com
The 70mm Newsletter
Written by: Showmen’s Trade Review, October 15, 1955 Date: 01.07.2008
Caption Picture missing): The Altec developed Switching Relay Equalizer rack, permitting knob-control switching from TODD-AO, to Cinema-Scope 4-track, to Perspecta, to optical print sound tracks, is shown at right. Above, Fred Pfeiff, of TODD-AO, is seen operating the relay switch at front of the Altec panel.

Climaxing numerous technical contributions its engineering staff has made to the sound phases of the TODD-AO system, Altec Service Corporation last week put into production its Switching Relay-Equalizer which provides compatibility with all existing sound systems. The device allows the projectionist to select the sound operation for TODD-AO, CinemaScope 4-track magnetic, Perspecta and standard optical prints. The Altec panel provides individual equalization and level balancing controls for 20 magnetic tracks. On a two-projector installation, the facilities allow setting the six-TODD-AO channels on each projector for dentical quality; likewise the four CinemaScope channels on each machine.
 
More in 70mm reading:

Todd-AO
The Todd-AO Projector

Showmen’s Trade Review, October 15, 1955:
Oklahoma! in Todd-AO
Todd-AO
Magna Theatres
Todd-AO Corporation
Philips Collaborated On Projector Design
Todd-AO Projection and Sound
Six track recording equipment
All-Purpose Sound Reproduction
Rodgers & Hammerstein II
Six track recording equipment

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Updated 07-01-21