![]() This is done to provide higher efficiency and greater output power. Effectively, one tube amplifies the "upper half" and the other tube amplifies the "lower half". The output waveform is still a clean, unclipped sine wave, because the transformer sums the two "halves" of the input signal into one composite signal. Cutoff refers to plate current cutting off on one side of a push-pull pair for a portion of the cycle, while the other side continues to function. Note that cutoff does not mean that the output of the amplifier is clipped, or distorting. If the amplifier is designed such that the plate current flows for more than half, but appreciably less than a full cycle, it is then a class AB amplifier. If each side is in cutoff for exactly half the input cycle, it is a class B amplifier. ![]() The Vox AC-30 is always brought up as an example of a class A amplifier, but is it really class A?įirst of all, how do you tell if an amplifier is class A? A push-pull amplifier is defined as operating in class A if, at the full undistorted output (just prior to clipping), the plate current flows in each tube for a full 360 degrees of the input conduction cycle. ![]() General There is a lot of discussion on the topic of class A amplifiers. ![]()
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