Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000170
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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PORTABLE RECORDING SYSTEM 167 In the second stage is a 6AS6 tube operating in a 30-kilocycle Hartley oscillator circuit, with suppressor-grid modulation obtained from the signal envelope described above. The output amplifier stage uses a 6AK6 vacuum tube. A grid potentiometer provides a control of the bias current and thus controls the amount of noise reduction being applied to the light valve. The output is transformer-coupled to a full-wave copper-oxide rectifier which is filtered to provide a modulated direct current varying inversely with the envelope of the signal. A volume-indicator meter and range switch similar to that provided TE.R AND &ANGE CONTROL EOUC1 MONSTOR VALVE. Fig. 6— RA-1282 amplifier— front view. in the mixer and a lamp-current control circuit are also included in this unit. The lamp-current meter may alternatively be switched to read the value of noise-reduction bias current. A front view of the amplifier is shown in Fig. 6. In the upper left are the amplifier-gain switch and oscillator-gain potentiometer. Below these are the oscillator OFF-ON switch and lamp operate-hold switch. The left-hand meter indicates lamp or noise-reduction-bias current as selected by the switch in the lower center. The lamp-current rheostat is located below the associated meter. The right-hand meter is the volume indicator with the volume-indicator range switch located immediately below. In the upper right are the noise-reduction input