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Check These Features
1. All transformers and chokes "Climatite" treated.
2. Plug-in type filter condensers.
3. Calibrated step-type volume control.
4. Wide range tone control.
5. Exciter lamp balance.
6. Exciter supply voltage control.
7. Photo-electric cell voltage control.
8. Auxiliary volume control.
9. Sound change-over in photoelectric circuit.
10. Built-in booth monitor and monitor amplifier.
11. Plug-type connections from chassis to cabinet.
12. Complete extra chassis available for stand-by pro
tection.
the PD50 Series Amplifier
COMPLETE SOUND SYSTEMS
Licensed under U. S. Patents of Western Electric Company, Inc. Listed with Underwriters Laboratories, Inc., and Canadian Standards Association.
Sound Heads • Amplifiers Two-Way Horn Systems
Check the features on this Ballantyne PD-50 Series Amphfier, as shown above, and you'll quickly realize why theatres all over the world are installing Ballantyne Sound Equipment.
Every known sound engineering advance has been incorporated into the PD-50 Series to make these amplifiers literally miracles of trouble-free operation. Plug-in type filter condensers can be changed in fractions of a second . . . complete sound control at working side of projector is achieved by the remote volume control and change-over . . . workmanship is of real engineering caliber throughout. Available for immediate delivery from your independent supply dealer.
THE BALLANTYNE COMPANY
1707-11 DAVENPORT STREET OMAHA,2, NEBRASKA
Export Department, FRAZAR & HANSEN, 301 Clay Street San Francisco 11, California, USA Cable Address "FRASEN"
NATIONAL
THEATRE SUPPLY
About Products for the Theatre
and people who make and tell them
ELECTRIC POWER PLANTS FOR BOTH ARC AND LIGHTING
The coal strike, which in some sections of the country curtailed theatre operation immediately, in some cities almost to the point of total closing, sent many theatre operators out in frantic search for substitute sources of electric power. Because of the extent of this sudden demand, relatively few theatres could promptly acquire genuine power plants of sufficient output, but one leading manufacturer, the Consolidated Diesel Electric Corporation, Mount Vernon, N. Y., was able to supply 43 installations in various parts of the East and Midwest.
Consolidated equipment, which is a unit integrating a generator and Diesel engine, is readily hooked into the theatre lines for service of both lighting and equipment. Most of the plants supplied in consequence of .the coal strike w«re of 25-30 kilowatt capacity rated at 6000 hours without major overhauling. Equipped with International Harvester Diesel engines, the plant starts on gasoline (only one gallon supply is required for this purpose), then switches to No. 2 fuel oil, with full power attained in one minute. Fuel is consumed at the rate of about 3 gallons per hour at the full 30-kilowatt capacity,
A plant of this capacity measures 5 feet high, 10 feet long and 4 feet wide. It is capable of continuous operation for 8 hours or a bit over with normal effect. A smaller plant adapted to the supply of essential lighting and projection arcs is available at half the cost of the larger type and consuming about 2j^ gallons of oil per hour at capacity. It can be equipped with automatic switch for emergency standby installation. All models are equipped with voltage regulators restricting fluctuation to plus or minus 2%.
Diesel exhaust is provided with hospital type muffler and is carried to the outside of the building.
IDEA BOOK ON LIGHTING
A new design manual on theatre lighting has been issued by the Lamp Department of the General . Electric Company, Nela Park, Cleveland. This one, entitled "Modernizing the Theatre with Light," presents a wide variety of schemes developed by C. M. Cutler, widely known specialist in the illuminnation of theatres and comparable buildings.
The booklet covers every public section
6
BETTER THEATRES. JUNE I. 1946