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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Clear as Mud! posted by Ryder on April 25, 2002 at 16:10:01:
Push-pull can be Class A. It all depends on the bias point and how hard you drive them. Single ended has to be Class A.The common (simple) definition for Class A is what your quote says.
But Class A, as used in a single ended amplifier, means more than that. In a single ended amplifier the current needs to increase and decrease in a linear, symmetrical way. Otherwise the output waveform will be distorted. This is described on page 604 of the AudioCyclopedia "little distortion exists because the grid signal operates in the most linear portion of the dynamic characteristic"
To put that in plain english, the tube is only allowed to operate in the linear part of the operating curve.
See figure 12-63 on page 543 "Class A is when the grid voltage is set....to obtain linear operation"
and page 523 "The quiescent plate current is selected for a value in the most linear portion....."I am only proposing that a push-pull amplifier, that is being advertised as "Pure Class A", follow the same rules.
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Follow Ups
- Re: Clear as Mud! - tre 16:59:41 04/25/02 (7)
- Re: Clear as Mud! - bill.ramsay 00:41:51 04/26/02 (4)
- Re: Clear as Mud! - tre 08:33:43 04/26/02 (3)
- sorry i thought that you were particularly talking about SE - bill ramsay 15:13:20 04/26/02 (2)
- Re: sorry i thought that you were particularly talking about SE - tre 15:32:07 04/26/02 (1)
- Re: sorry i thought that you were particularly talking about SE - bill ramsay 00:31:06 04/27/02 (0)
- Still clear as Mud! - Ryder 18:24:30 04/25/02 (1)
- Re: Still clear as Mud! - tre 20:37:14 04/25/02 (0)
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