F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000571
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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THEORY AND WIRING OF AMPLIFIERS 553 to cathode by the extent of the voltage drop through the resistor. Details of Common Amplifier Circuits All of the foregoing can be illustrated, and any details that may still seem dubious will perhaps be made clearer, by detailed analysis of the circuits of actual theatre amplifiers. Figures 139 and 140 have been chosen for this purpose. They represent two amplifiers that are perhaps the most widely used at the present time. n A/WVWV A Fig. 138. — Method of obtaining grid bias by voltage drop in plate circuit. Circuits of Figure 139 At the bottom of Figure 139, near the right-hand corner, are two arrowheads that show connection to a 110-volt power line. Above them is the power switch of the amplifier, through which the 110-volt circuit runs to the primary or right-hand coil of the power transformer, T-3. T-3 has four secondaries, shown to the left of the three vertical lines that represent its core. Thes top secondary lights the filaments of the two type 80 rectifier tubes. Just below this is the long (high voltage) secondary that supplies plate power to those tubes, and through them to the amplifying tubes, as we shall see. Below this again is a secondary winding terminating in two arrowheads. To the left of the upper arrowhead is