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Fig. 6. RCA Stereoscope speakers.
pressor. An idler-roller permits adjustment to various lengths of film paths required for different makes of projectors.
Altec designed and manufactured several hundred penthouse reproducers and complete stage and auditorium surround speaker, amplifier and changeover systems.
RCA developed a complete sound system for CinemaScope (Fig. 5), including a "button-on" 4-track magnetic head cluster, film-driven soundhead, amplifier and suppressor panel.26 Where booth space permitted, 5500-ft magazines were installed. The RCA WideArc Lamp can operate 10-mm Hitex positive carbons at 135 amp. The newtype "Ubangi" stage speakers (Fig. 6) have excellent fidelity and coverage.
Motiograph introduced the AAA magnetic penthouse reproducer which uses a tight-loop film transport system, a minimum of magnetic material in the assembly, a tilt top to space the upper
magazine away from the front wall and a "snubber" roller to reduce or eliminate film damage at the start of a reel.
Magnasync is producing the Magnaphonic PH-1435 penthouse reproducer (Fig. 7) for use with CinemaScope. It is protected against magnetic flux patterns generated by the projector motor and remote "dowser" solenoid. The WC-435 preamplifier group protects the side-wall speakers from the 12-kc control frequency. A master ganged fader for the three stage speakers, power supplies and a series of power amplifiers complete the stereophonic reproduction system.
Ampex developed three series of stereophonic playback equipments for CinemaScope motion pictures: Super systems, with a bank of preamplifiers for each projector and complete electronic change-over; DeLux systems with all protection features of the Super, but with manual change-over; and Master systems with extensive protection fea
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