Biasing a Class A amp information - diyAudio
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Old 6th January 2004, 03:43 AM   #1
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Default Biasing a Class A amp information

I am trying to show the results biasing has on tubes for class A amps. What difference will biasing make on the shape of the wave (if it does anything at all)? Any place for info on this? Thanks alot.
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Old 6th January 2004, 07:44 AM   #2
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Old 6th January 2004, 11:34 AM   #3
maylar is offline maylar  United States
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Biasing moves the quescent point up or down on the load line. It's easier to envision what happens if you have the characteristic curves of the tube in front of you. The load line is from supply voltage (V+) to max plate current (V+/RL).

Normal Class A operation is to bias the tube such that plate current is 1/2 of V+/RL. That gives the most output voltage swing. As you move the quescent point either way it takes less input voltage to reach the non-linear regions of the curve (output will clip sooner).
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Old 6th January 2004, 06:38 PM   #4
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Its for a SE Hi Octane built form I am trying to write a report on how biasing affects the performance.
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