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The A B C of Vacuum Tubes, in Radio Reception: An Elementary and Practical Book on the Theory and Operation of Vacuum Tubes, As Detectors and Amplifiers
The inauguration of radio-telephone broadcasting has quickly aroused an enormous general interest in radio reception of speech and music. The possibilities of this new method of broadcasting information of general interest and entertainment can hardly be estimated. The method is revolutionary and has been aptly compared to the invention of the printing press in this respect.
Vacuum tubes make possible the reception of radio-telephone speech and music and radio-telegraph signals with a degree of satisfaction not approached by prior devices.
The vacuum tube appears to the layman as a complicated form of incandescent electric lamp which operates in a very mysterious manner. In writing this little book the author has endeavored to overcome this impression and to clearly set forth the elementary principles of theory and operation. It is assumed that the reader has no knowledge of radio and very little, if any,, of electricity. Mathematics has been especially avoided in the treatment of the subject and no technical terms are used without their meaning being made clear.
The functioning of the “lamps†is fascinating to a great many people and the author hopes that the desire for elementary information regarding it will be fulfilled in the text. No attempt has been made to set forth all the possible circuit arrangements but those shown may serve as suggestions to experimenters who desire to evolve their own circuits. The practical questions and answers, it is hoped, may be of value to those who are contemplating the installation of receiving equipment or who are getting unsatisfactory results because of insufficient information.
The Author.
This classic is organized as follows:
I. Introductory
Electrical Current
Electrical Pressure or Electro-Motive Force
Resistance
Direct Current
Alternating Current
Frequency
Inductance
Capacitance
Resonance
Oscillations
The Reception of Signals
Wave Length
Tuning the Receiving Antenna
The Antenna as a Complete Circuit
II. The Vacuum Tube as a Rectifier and Relay Without Moving Parts
Tube Construction
The Edison Effect
Electron Emission from a Heated Filament
Dependence of Plate Current upon Plate Potential
Dependence of Plate Current upon Filament Current
Effect of Grid Potential upon Plate Current
Relay Action
Rectification
III. The Vacuum Tube Detector
The Telephone Receiver
Simple Detection
Detection with Grid Condenser
Effect of Gas in a Detector Tube
Heterodyne Action, or the Production of Beats
IV. The Vacuum Tube Amplifier
General Characteristics
Amplification Factor
Audio Frequency Amplification
Radio Frequency Amplification
Radio-Frequency Regenerative Amplification
Autodyne Production of Beats
V. Practical Circuits and Their Operation
Methods of Coupling
The Variometer
Inter-Electrode Tube Capacitance
Wave Length, Frequency and Resonance
Circuits
VI. Voice Distortion
Amplifier Transformers
Grid Potential
Too Great Regeneration
Overloading of Tubes
Telephone Receiver
Conclusion
VII. Practical Questions and Answers
