Motion Picture Herald (Jan-Feb 1939)

Page scan 000104 from Motion Picture Herald

Record Details:

Title:
Motion Picture Herald
Date:
Jan-Feb 1939
Publisher:
[New York, N.Y. : Quigley Pub. Co.]
Volume:
Motion Picture Herald (Jan-Feb 1939)
Leaf #:
000104
Language:
English
Subjects:
motion pictures, Motion pictures -- Periodicals
Collection:
Hollywood Studio System
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Founded in 1915 by a Chicago printing company as a regional trade paper for Midwest exhibitors. In 1916, editor Martin Quigley bought out the owners, and over the next 15 years, he grew EXHIBITORS HERALD into one of the most important national, weekly trade papers in the film business. Quigley acquired MOTOGRAPHY in 1917 and MOVING PICTURE WORLD in 1927. In 1930, he acquired MOTION PICTURE NEWS and the new 'consolidated' publication became MOTION PICTURE HERALD. From the pulpit of his editorial page, Quigley preached the need to improve the motion picture industry and improve the quality of the films. He skillfully served as a mediator in disputes -- between distributors and exhibitors, between the film industry and the Catholic Church (Quigley was one of the architects of the Production Code). Quigley claimed that EXHIBITORS HERALD represented the 'independent exhibitor' and sections like 'What the Picture Did for Me?' certainly provided a forum for theater owners. But plenty of exhibitors viewed Quigley as a servant to the studios and large theater chains. In response, publications such as SHOWMEN'S TRADE REVIEW, INDEPENDENT EXHIBITORS FILM BULLETIN, HARRISON'S REPORTS, and BOX OFFICE were either formed or grew significantly in the years following Quigley's brief moment of consolidation in 1930. -- Eric Hoyt, 2014
Date Added:
May 30, 2024
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DISTORTION ORIGINATING IN AN AMPLIFIER Continued from preceding page THE TROUBLE TESTS 13. Take all available readings 14. Replace all tubes 15. Check all socket voltages, using high resistance meter 16. Replace tubes showing abnormal readings J 7. Check socket voltages of tubes reading abnormally, and investigate faulty sup* ply circuits common to the tubes affected 18. Look for trouble cause in those portions of the faulty supply line which is common only to the tubes affected 19. Replace all tubes 20. Check setting and tightness of connections of all adjustable by-pass condensers or other devices in the amplifier for modifying sound quality 21. Correct setting THE CONDITION FOUND All readings normal One or more readings abnormal TROUBLE CURED Distortion remains All voltages normal Some voltages abnormal TROUBLE CURED Distortion and abnormal reading remain TROUBLE FOUND TROUBLE FOUND TROUBLE CURED Distortion remains Setting wrong Connection faulty All settings and connections okay TROUBLE CURED NEXT TEST No. 14 No. 16 No. 15 No. 20 No. 18 No. 17 No. 20 No. 21 No. 22 No. 23 THE TROUBLE TESTS 22. Tighten connection 23. Check setting and tightness of connections of reverse feedback circuit or harmonic equalizer, if any 24. Using headphones check through successive stages of amplification to find stage at which distortion appears 25. Check with ohm meter, and visually and manually if necessary, all connections and insulation of faulty stage speech circuits, tugging at contacts, etc. 26. Using ohm meter, test all parts carrying speech current in faulty stage 27. Test capacitance of or replace all condensers carrying speech current in faulty stage 28. Replace all speech transformers and choke coils carrying speech current in faulty stage 29. Apply Tests 25, 26, 27 and 28 successively to all speech circuits of the amplifier THE CONDITION FOUND TROUBLE CURED Setting wrong Connection faulty All settings and connections okay No reverse feedback or harmonic equalizer Faulty stage found Beginning of distortion cannot be distinguished TROUBLE FOUND No trouble found TROUBLE FOUND No trouble found TROUBLE CURED Trouble remains TROUBLE CURED TROUBLE FOUND NEXT TEST No. 21 No. 22 No. 24 No. 24 No. 25 No. 29 No. 26 No. 27 No. 28 WARNING: In applying Tests 5, 6, 9, II, 15, 17 and 24, above, and similar tests of the earlier charts referred to, take all precautions against contact with high voltage, using long, well-insulated test prods and well-insulated test leads. NOTE: When replacing tubes in a group, per tests 10, 14 and 19, above, set replaced tubes aside to be tested individually before discarding. Some (or in certain cases all) may be entirely faultless. To Determine the Cause and Correction of DISTORTION, ORIGINATING AT A SPEAKER THE TROUBLE TESTS • 1. Examine all speaker guy wires, ropes or supporting cables for sympathetic vibration, touching or grasping them and listening for any resulting changes in the distortion 2. Wrap vibrating guy in rags, ozite or flannel over a fair portion of its length 3. Similarly check baffle, horn or trumpet for sympathetic vibration of any part, attachment or mounting fixture 4. Thoroughly tighten down vibrating part 5. Wrap or wedge vibrating part to prevent vibration. 6. Replace vibrating part 7. Check whether speaker unit is tightly mounted to baffle 8. Tighten unit on baffle 9. Examine speaker terminal strip for loose connections THE CONDITION FOUND Speaker guy vibrating No vibration found TROUBLE CURED Vibration found No vibration found TROUBLE CURED Part cannot be tightened TROUBLE CURED Vibration cannot be prevented TROUBLE CURED Mounting tight Mounting loose TROUBLE CURED TROUBLE FOUND All connections tight NEXT TEST • No. 2 No. 3 No. 4 No. 7 No. 5 No. 6 No. 9 No. 8 No. 10 THE TROUBLE TESTS • 10. Test speaker field coil and hum-bucking coil (if any) with ohm meter for imperfect continuity 11. Replace speaker unit 12. Test voice coil with ohm meter, simultaneously vibrating diaphragm (if possible) by hand 13. Replace voice coil and diaphragm 14. Remove speaker unit and open as necessary to examine diaphragm mounting 15. Tighten diaphragm, checking centering with proper shims as required 16. Observe diaphragm appearance 17. Using proper shims, check centering of voice coil 18. Center voice coil (if it shows no signs of being damaged, or loose on the diaphragm ) 19. Remove diaphragm and inspect voice coil for damage, looseness, etc. THE CONDITION FOUND Intermittent open or short No trouble found TROUBLE CURED Intermittent open or short No trouble found TROUBLE CURED Diaphragm loose Diaphragm mounting normal TROUBLE CURED Some distortion remains Diaphragm bent Diaphragm torn Diaphragm normal Voice coil properly centered Voice coil off center TROUBLE CURED Some distortion remains Voice coil damaged or loose NEXT TEST • No. II No. 12 No. 13 No. 14 No. 15 No. 16 No. 16 No. 13 No. 13 No. 17 No. 19 No. 18 No. 19 No. 13 NOTE: If any test from No. 10 to No. 19 cannot be carried out because of the nature of speaker construction or through lack of suitable facilities such as centering shims, a simpler but more expensive remedy is afforded by No. I I. 24 Better Theatres