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This is not an uncommon condition and is caused by filament and
late vibration adding vibration of the glass covering of the tube
; Fo the amplifier output circuits, thereby changing the tube from its intended Panerion to that of an undesira i microphone. Defects of this nature in vacuum tubes are due to (a) the tube has passed its normal life; (b) faulty manufacture. When tubes are received from the supplier containing this defect NOTIFY THE PROJECTION DEPARTMENT.
GEAR AND SOUND HEAD NOISE
There are times when a mechanical noise is reproduced through — the sound system which is not a part of the original recording.
This defect is caused by improper poe vote of new exciter lamps when they must be replaced. On calling this to the attention of the projectionist, this condition can readily be rectified.
OPROCKET HOLE NOISE
There are times when such sounds as the put-put of a motor boat will be heard. This noise is reproduced due to the sprocket holes of the film basS2 08 in front of the sound track optical system and is
caused by improper adjustment of the film guide rollers of the sound head. This can be adjusted immediately upon notification to the projectionist. im
& EXTRANEOUS NOISE
A seasonal noise which can sppeet as distortion in the reproduced sound may be occasioned by vibrations, transmitted by machinery, generating a mechanical vibration which may be misunderstood as emanating from the horn system. For example, starting up the theatre fT cond) | lon ae sye tem or fans can generate a sound which was not apparent prior to the starting of this machinery.
LOSS_OF SOUND
Among the most common causes of loss of sound are power failures equipment’ burn-out, projector motor failures, switch failures, the
Bri pps of mechanisms and sound head gears, and individual circuit fuse. blowing. It should be very readily apparent that a thorough familiarity of the location of all power fuses by all projectionists, as well as the manager, and in,a good many cases the house electrician, should be the general pron sdus ue of good maintenance practice. Therefore, when power failures,occur within the theatre, the minimum of time would be consumed in replacing burnt out fuses. In the matter of equipment burn-out, a great many circuits in the sound equipment are of such a delicate nature that it often is necessary to make extensive tests with the proper instruments to determine the exact
seat of the trouble.
In the case of burned-out tuhes, it very rarely requires more than a minute or two for the projectionist to locate and replace such a
defective tube. Motor failure, however, is of a more complex nature, particularly when the motor actually burns out, as this may require