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Updated: May 17, 2025
It swung up, and he saw a pock-marked face that was twisted in a smile meant to be ingratiating. "You've got a pad on your tail," the kid said, again as low as his amplifier would permit. "Need a convoy?" Gordon studied him briefly, and grinned. Then his grin wiped out as the kid's arm flashed to his shoulder and back, a series of quick jerks that seemed almost a blur.
All these must be tested out by the aid of a storage battery. When the defective parts had been discarded, it was necessary to piece together, out of the remaining parts and the extra equipment, an entirely new set. "Have to use a two-stage amplifier," shouted Curlie, making himself heard above the storm. "Lower voltage on the grid, too," Joe shouted back.
Run this wire on over and connect it with the first post of the second rheostat, the second post of which is connected with one terminal of the filament of the first amplifying tube; then connect the first post of the rheostat with one end of the secondary coil of the first audio frequency transformer, and the other end of this coil with the grid of the first amplifier tube.
When a stream of electrons is flowing between two metal elements, as a filament and a plate in a vacuum tube detector, or an amplifier, they act as carriers for more negative electrons and these are supplied by a battery as we shall presently explain.
Since the diagram shows only one amplifier and one radio frequency transformer, it is consequently a one step amplifier; however, two, three or more, amplifying tubes can be connected up by means of an equal number of radio frequency transformers when you will get wonderful results.
The Vacuum Tube Oscillator. As explained before you can use any amplifying tube that is made for a plate potential of 100 volts. The current required for heating the filament is about 1 ampere at 6 volts. A porcelain socket should be used for this tube as it is the best insulating material for the purpose. An amplifier tube of this type is shown at H and costs $6.50. The Storage Battery.
To understand how a vacuum tube acts as a detector and as an amplifier you must first know what electrons are. What Electrons Are. The little black circles inside the large circle represent positive particles of electricity and the little white circles outside of the large circle represent negative particles of electricity, or electrons as they are called.
Set the vacuum tube amplifier back of the rheostat and the A and B batteries back of the parts or in any other place that may be convenient. The fixed condensers and the grid leak can be placed anywhere so that it will be easy to connect them in and you are ready to wire up the set. Connecting Up the Parts for a Crystal Detector.
The gas filled tube, however, can be used as an amplifier and either kind of tube can be used for either radio frequency or audio frequency amplification, though with the exhausted tube it is easier to obtain the right plate and filament voltages for good working. The Fixed Resistance Unit, or Grid Leak. Grid leaks are made in different ways but all of them have an enormously high resistance.
The vibrating amplifier in the machine monitors and records each electrical impulse, then furnishes it back to your brain as a successive series of repetitious vibrations, each identical in shape and magnitude, just as if you had actually read and re-read that list of stuff time and again." "And then I'll know it cold?" James shook his head. "Then you'll be about as confused as you've ever been.
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