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Updated: May 17, 2025
For instance with a wireless telephone transmitter where an amplifier tube is used to set up the oscillations and which is made for a plate potential of 100 volts, distances up to 10 or 15 miles can be covered. Where two 5 watt tubes connected in parallel are used wireless telephone messages can be transmitted to distances of 40 or 50 miles.
On the other hand grid leaks cost less but they are more troublesome to use as you have to find out for yourself the exact resistance value they must have and this you can do only by testing them out. A Grid Leak Amplifier Receiving Set. With Crystal Detector.
Eradicate thought for a moment, and then said: "Well, I done turned on de current, laik I seen you done, Massa Tom." "Yes, go on. You connected the telephone." "Yas, sah. Den I switched on that flyer thing yo' all has rigged up." "You switched on the amplifier, yes. Go on." "An' an' den I plugged in dish year wire," and the colored man pointed to one near the top of the booth.
For instance with a wireless telephone transmitter where an amplifier tube is used to set up the oscillations and which is made for a plate potential of 100 volts, distances up to 10 or 15 miles can be covered. Where two 5 watt tubes connected in parallel are used wireless telephone messages can be transmitted to distances of 40 or 50 miles.
It was the 1939 edition and I found a circuit for a receiver which looked simple enough for me to try. It was described as a regenerative detector and audio amplifier. One was the Electron run by George Spanos, who was the agent for the Dutch Philips company.
The amplifier tube is a variable relay in that the feeble currents set up by the incoming waves constantly and proportionately vary a large current that flows through the headphones. This then is the principle on which the amplifying tube works. The Operation of a Simple Vacuum Tube Receiving Set.
Where radio frequency or audio frequency amplifiers are used to couple your amplifier tubes in cascade you must take particular pains to shield them from one another in order to prevent the feed back of the currents through them, which makes the head phones or loud speaker howl.
He adopted the same method of modulation using a record player amplifier and an Astatic crystal microphone. W.A.C. was achieved by February 1948 with about 50 watts of R.F. into a simple dipole antenna. During the ten months that SV1WE was active 750 QSL cards were sent out. Of the 61 countries worked only 49 were confirmed.
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.
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.
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