Sound motion pictures : from the laboratory to their presentation (1929)

Record Details:

Title:
Sound motion pictures : from the laboratory to their presentation
Date:
1929
Publisher:
Garden City : Doubleday, Doran & Company, Inc.
Volume:
Sound motion pictures : from the laboratory to their presentation
Leaf #:
000208
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 22, 2024
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i88 SOUND MOTION PICTURES FUSE MARKING FUSE RATING "Bias" 250V-20" JACK ECX50 "Loudspeaker Fields" "15-volt Generator" 250V-1A 250V-60A CIRCUIT Bias voltage Power amplifier Loudspeaker Field Positive line; 15volt generator Failure of the fuses marked "Loudspeaker Fields" will be indicated by no sound in the auditorium loudspeakers. If the fuse marked "15-volt Generator" fails, the "Charge-Discharge" ammeter will indicate a discharge reading of about 35 amperes. If a fuse fails, do not attempt to replace it with a new one until the cause for the failure has been determined. In case a new fuse does not cure the trouble be sure to check the fuses on the panel board at the motor-generator set. D. C Batteries If the grid voltage as measured on the EC12X1 or the EC3X5 jack falls below the minimum value given in the Meter Reading Table, the batteries should be replaced. The batteries used are two 4 J volt Burgess No. 2370 and one 22|-volt No. 4156, all connected in series, as shown in T-3870180, included in envelope in the back cover of book supplied by the manufacturers. Be sure the connections on the C batteries are clean and tight, and keep a spare set of batteries on hand for replacement. E. Voltage Amplifier Tubes If the plate current readings (IPiXi,IP2Xi,or IP3X5) for any one of the three tubes is abnormal, check the grid voltage (EC12X1 or EC3X5) for this particular tube. (See Meter Reading Table, page 193.) If the grid voltage is correct and the plate current readings for the other two