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

Page scan 000563 from F. H. Richardson's bluebook of projection

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 #:
000563
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 545 negative, and vice versa. In consequence the plate current of the upper tube will decline while that of the lower tube increases, with corresponding reciprocity in the two halves of the plate transformer primary. This push-pull or see-saw arrangement is used in almost all theatre amplifiers. It is a very simple modification of the circuit of Figure 128. 0 t A ^—11 ) Fig. 134. — Fundamental circuit for push-pull amplification. Inter-Electrode Capacitance (13) We have noted before that the grid and cathode of a tube constitute two plates of a condenser, since they are insulated by vacuum and negatrons do not strike the grid. The same is true of the plate and the grid. They are conductors, they face each other, they are insulated from each other — hence they constitute a condenser, and capacitance exists between them. "Feed-back" may take place as a result of this capacitance. (14) Feed-back is the name given to the condition where changes in plate voltage, resulting ultimately from changes in grid voltage, are "fed back" to the grid by the grid-plate capacitance. Inter-electrode capacitance, and therefore feed-back, exists in all three-element tubes, but does no serious harm unless an attempt is made to