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Updated: May 22, 2025
Connect this filament terminal with the or negative electrode of the A battery and the + or positive electrode of this with one post of the rheostat and lead a wire from the other post to the free terminal of the filament.
The apparatus you need for this set includes: a loose coupled tuning coil, a variable condenser, two fixed condensers, a crystal detector, or better a vacuum tube detector, an A or 6 volt storage battery, a rheostat, a B or 22-1/2 volt dry cell battery, a fixed resistance unit, or leak grid as it is called, and a pair of head-phones. The Vacuum Tube Amplifier.
It has the same resistance, namely 5,000 ohms as the one used with the 5 watt tube transmitter, but it is a little larger. It is listed at $1.65. The Oscillation Choke Coil. The choke coil in the power circuit is made of about 260 turns of No. 30 B. & S. cotton covered magnet wire wound on a spool 2-1/4 inches in diameter and 3-1/4 inches long. The Filament Rheostat.
"The control is this secondary power cable running down my arm to my hand. That gives you your direction, and the rheostat here at the belt changes the velocity. "I've only made this one so far, but I've ordered six others like it. I thought you guys might like one, too." "I think you guessed right!" said Morey, looking inside the power case. "Hey! Why all the extra room in the case?"
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.
You can, however, get very good results without any special charging arrangement by simply connecting one post of the rheostat with the negative terminal of the filament and connecting the low potential end of the secondary of the tuning coil with the or negative electrode of the A battery. This scheme will give the grids a negative bias of about 1 volt.
He sensed his Planeteers beside him as the figures loomed ahead. He gave a final spring that sent him through space with knees bent and outthrust, his hands reaching. His knees connected solidly with the Connie’s thighs and his hands groped around the bulky space suit. He felt a rheostat control and twisted savagely, then groped for the distinctive star-shaped button of the air supply.
The first time, it killed the bugs for all of us who smoked and it didn't work for you because you never learned the habit." Lou had the tractor turned and the rheostat all the way to the floor. She was sitting up now, but she wasn't fully satisfied. "The percentage of immunes seems about right. But why do some of the smokers get the disease while some don't?" "Why not?
A movable contact arm that slides over and presses on the turns of wire is fixed to the knob on top of the rheostat. A rheostat that has a resistance of 6 ohms and a current carrying capacity of 1.5 amperes which can be mounted on a panel board is the right kind to use. Assembling the Parts.
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.
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