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Results tagged with vacuum-tube
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user 218625
Any device that incorporates an evacuated chamber in which free-floating electrons are manipulated.
1
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Why triodes for high power tubes
Check out this article about beam power tetrodes: http://www.r-type.org/articles/art-024.htm titled "The Beam Tetrode".
According to the last 2 paragraphs, triodes now seem to be able to give better …
- 421
0
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In a vacuum triode, what prevents the grid from acting as another anode?
If the grid goes positive, it does act as an anode & you get grid current. In transmitter class C output stages, they used to use the grid as a rectifier to generate its own bias, which was stored on …
- 421
1
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In a parallel plate capacitor, how does placing a metal in between the plates reduce the cap...
The screen grid does not do much screening in the true sense of the word. It does the same job as the 1st accelerator grid in a CRO tube or picture tube. It pulls the electrons from the cathode & fire …
- 421
0
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Interference between speaker and vacuum tubes
I came across a very interesting article by L L (Bill) Williams, published in The Bulletin of the British Wireless, about beam power tetrodes.
The beams are not those viewed from above, formed by the …
- 421
0
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Triode - how come grid is "more negative" than cathode?
You think that is confusing. If they had got it right about 300 years ago when they rubbed a sheet of glass and got a spark from it & assumed the electricity was jumping off, instead of electrons bein …
- 421
1
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Can someone explain this tube amplifier circuit for me?
I have the feeling, the reason for feeding power through R4-8 from P1 of Tp3 to the 250V supply is to null out the audio noise on the 285V supply, caused by the loading from the output stage (not the …
- 421
0
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Magnetron Working Principle
Firstly, when a capacitor is charging or discharging, there is a charge current between the plates, which has its own magnetic field like a conductor, even if it's a vacuum. The magnetron anode is a c …
- 421
0
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Can a lower voltage overheat a magnetron?
Magnetrons don't conduct until the voltage is within about 100V of their rated voltage, because the magnetic field that spirals the electrons around inside steers them back toward the cathode. The vol …
- 421