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1952 Theatre Catalog, 10th Edition, Page 400 (362)

1952 Theatre Catalog, 10th Edition
1952 Theatre Catalog
1952 Theatre Catalog, 10th Edition, Page 400
Page 400

1952 Theatre Catalog, 10th Edition, Page 400

a matter of seconds by dipping a switch located in the projection booth. The projection tubes employed are highly efficient and require a maximum of 30,000 volts. This voltage limitation reduces insulation and breakdown troubles, provides longer tube life and lower replacement costs, in addition to lessening the danger from high

voltage. A specially designed video circuit makes pOSSible screen brightness equal to that obtained from equipment operating at much higher voltages, it is claimed. Protection against heating of the component parts is provided by a built-in ventilating system.

Equipment in the projection booth is kept at a minimum and consists of two

. IN THE AUDITORIUM the proiection unit containing duplicate picture tubes. optical assemblies. high voltage transformers, and scanning control equipments, is housed in a cabinet mounted on brackets and {ran-rework which are supplied by the manufacturer. Two small conduits connect it to the booth.

units-a combination tuner and monitor and a control panel. The combination tuner will pick up regular open-circuit TV programs (channels 2 to 13) and monitor either this circuit or the incoming closed circuit line (coaxial or microwave). The control panel is mounted 'on the front wall of the booth and can easily be handled by projectionists with no other technicians required.

Requires Little Space

Most direct-view theatre TV systems consist of three units. The projector is placed in the auditorium, usually in the front of the balcony and, Where there is no balcony, the projector must be mounted on a retractable boom from the ceiling. Secondly, there is the high voltage power supply, Which may be located most anywhere except the auditorium and the projection room, with the generator room the preferred location. Thirdly, there is a control rack mounting the monitor, off-the-air receiver, vertical deflector amplifier, power supply units, control panel, horizontal deflector amplifier and various other controls.

The Trad system, on the other hand, features simplicity in equipment and operation. The two projectors, two high voltage power supply units, two of each type of amplifier, in fact, everything except the projection room located monitor, the off-the-air receiver and the control panel, are all encased in the one cabinet that is conveniently located in the auditorium. Naturally, since the installation is much simpler, it is less expensive than many competitive systems.

The dual projector may be located on the back wall of the auditorium in most theatres or on the front of the balcony if preferred. As the cabinet housing the Trad projectors is long rather than deep, it may be mounted in the front of the balcony without loss of seating capacity. The fact that Trad TV can be located on the auditorium rear walls eliminates the necessity for the installation of a retractable boom to support the projector from the ceiling.

The monitor and control panel take up so little space that even in the smallest projection rooms there is plenty of space for the Trad TV controls without shifting any of the usual theatre equipment. The placement of the high voltage power supply and amplifiers within the cabinet housing the two proprojection units assures efiiciency in maintenance and operation.

Line Connections

Stress is laid upon the importance of ordering theatre TV equipment as soon as possible with the warning that those who donit order or buy now not only have to wait some time for delivery and installation but they will have to wait considerably for installation of connection between their theatre and a coaxial cable line. Even now some sections of the country will see delivery of equipment coming through that will have to lie idle awaiting cable connections to be made by local telephone companies. In some of these situations, where there is normal television operation, theatres can pick up ordinary telecasts for test or actual use on screens after obtaining permission to do so, thus making use

1952 Theatre Catalog, 10th Edition, Page 400