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Updated: June 17, 2025
If you want to add an amplifier tube then connect it to the posts instead of the headphones as described in the foregoing set. All receiving sets that receive over a range of wave lengths of from 150 meters to 3,000 meters are called intermediate wave sets and all sets that receive wave lengths over a range of anything more than 3,000 meters are called long wave sets.
Now with a properly designed amplifier tube a very small negative voltage on the grid will keep a very large positive voltage on the plate from sending a current through the tube, and oppositely, a very small positive voltage on the grid will let a very large plate current flow through the tube; this being true it follows that any small variation of the voltage from positive to negative on the grid and the other way about will vary a large current flowing from the plate to the filament.
Connect the first post of the variable condenser to the + or positive electrode of the A battery and its or negative electrode with the rotating contact arm of the rheostat. Next connect one end of the resistance coil of the rheostat to one of the posts of the amplifier tube that leads to the filament and the other filament post to the + or positive electrode of the A battery.
The boys looked at each other, then looked suddenly away, trying their best to control the corners of their mouths. However, when the concert was over and the last soprano solo, flowing so truly through the horn-shaped amplifier, died away into silence they saw that Aunty Bixby's bright old eyes were wet. "Drat the thing!" she said, feeling blindly for a handkerchief.
Bob dropped his book and, leaping to his feet, strode to his chum's side. "What is it?" "Put on a headpiece, Bob," said Frank in a voice of great excitement. "I believe Jack is trying to get us." Excited as his chum, Bob clamped a receiver on his head, while Frank manipulated the "amplifier" and "detector" knobs on the control apparatus.
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.
'Brigadier of 184 speaking, he would say; 'Are you the Bucks.... What regiment are you? There was an 'amplifier' at 'Tank Dump'; it was always most faithfully manned about 8 p.m. The example which the General set was especially fine. He spent every day and nearly all day in the front line.
Where a six step amplifier, that is, where six amplifying tubes are connected together, or in cascade, the first three are usually coupled up with radio frequency transformers and the last three with audio frequency transformers. A radio frequency transformer is shown at B and costs $6 to $7. An Audio Frequency Transformer Amplifying Receiving Set.
This tube is made like the amplifier tube described for use with the preceding experimental transmitter, but it is larger, has a more perfect vacuum, and will stand a plate potential of 350 volts while the plate current is .045 ampere. The filament takes a current of a little more than 2 amperes at 7.5 volts. A standard 4-tap base is used with it.
Then I tried another and another, meanwhile continually adjusting the amplifier; and as a result I am now able, at will, to do either or all of the following: I can induct sounds from the Blind Spot; I can induct light, or visibility; or any given object or person, in toto. And now to tell how. No, I'm just sleepy, not weak. Let's see; where was I? Oh, yes; those connections.
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