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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Tube amplification posted by Camrahnbay on April 26, 2010 at 14:30:03:
The heated filament/cathode is able to emit electrons. These are attracted to the anode or plate, which is positively charged with respect to the cathode, giving an electrical current. This configuration constitutes a diode, in which there is no amplification.
The simplest asmplifying valve or tube is a triode, in which a spirally wound thin wire "grid" is placed between the anode and cathode. This is negatively charged with respect to the cathode and repels some of the electrons that try to fly to the anode. The more negatively charged the grid becomes, the fewer electrons get through, thus the current is reduced. Varying the charge on the grid causes the cathode-anode current to vary accordingly and this constitutes amplification of the varying voltage on the grid.
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Follow Ups
- RE: Tube amplification - Ray Moth 17:13:52 04/26/10 (2)
- To pick up where Ray left off... - Tre' 19:59:26 04/26/10 (1)
- RE: To pick up where Ray left off... - Vinylized 12:07:43 04/29/10 (0)
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