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Page 40
Projection Engineering, April, 1930
Who is Responsible for the Quality of Sound?
The supervisor of a large chain of theatres has this to say about the responsibility of the Projectionist: — ■
"The Projectionist is wholly responsible for the quality of sound in his particular theatre. He is also responsible for proper maintenance and operation of the equipment. He can have no alibis for poor results — provided he is given the proper equipment to work with. While the major sound picture equipment companies service their installations this, however, does not relieve the projectionist of responsibility for his apparatus."
Let Weston assume this responsibility
Weston makes an instrument known as Model 547 for servicing sound equipment. With this Test Set the Projectionist is able to quickly and conveniently check amplifiers and tubes, making certain that they are maintained in proper operating condition.
The small investment represented by this instrument provides the theatre management the best insurance against poor sound reproduction. Write for your copy of instructions on the use of Model 547 for servicing sound equipment.
WESTON ELECTRICAL INSTRUMENT CORP.
608 Frelinghuysen Ave.
NSTRUM
Program Supply System
The Greatest Volume Ever Attained,
without Sacrificing the Full Rich Tone
of the Natural Sound.
A QUALITY PRODUCT, DESIGNED FOR QUALITY REPRODUCTION
fiST
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tSSEESSI jgitt-.
eases
THIS system is UNIQUE. It incorporates a mixing panel which allows the use of two microphones, a phonograph pickup, and a screen-grid radio receiver either singly or at the same time. This unit may be modified to suit any requirements. The complete system is capable of supplying power to upwards of 200 speakers, making it suitable for every form of program distribution service, and in addition to the mixer includes a voltage amplifier and power level indicator panel, a power amplifier panel, and rectifier, filter and power panels.
The outstanding electrical features are: The entire system is operated from the A C line and may be operated at full gain without an appreciable hum.
One power supply for A, B, and C voltages, resulting in economy in cost and operation since there is no duplication of parts as in systems where separate power supplies are used.
It incorporates the latest development in rectifiers, the Hot Cathode Mercury Vapor type. The low tube drop of this type together with the low resistance filter system, results in a power supply with excellent regulation, allowing the use of the multiplicity of stages on a single power supply.
Meters are provided for reading microphone button current and space current in the output amplifier tubes. Simply press a button and the desired current is read on the meter.
The comparatively high power output available allows its use in ordinary installations at far below the overloading point with all the obvious desirable features thereof.
The entire system is mounted on a standard A-type rack on metal panels with crackle enamel finish, dust covers being provided for each unit. Also mounted on our special portable type rack.
WRITE FOR FULL INFORMATION
GENERAL INDUSTRIES CORPORATION 222 Grove Street WALTHAM, MASS.