To me, it seems like these two points are contradictory. Class B means less than 360 degrees output. Some of the waveform is missing, there must be distortion.
. However, with Darlington output transistors, there may be some 'thermal memory' after each half cycle of current conduction to reduce the Vbe* of the Darlington (Vbe[Q1] X Vbe[Q2]) to allow a temporary class-AB bias, or at least a lesser class B. I suspect the diodes are to be kept at the same temperature as the drivers.
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Yes. Bimbla, please ask yourself: if running the amp in class B and getting rid of the Vbe multiplier is such an easy way to get a good amp with no thermal issues, why is it that there are NO class B amps on the market?
Is every audio designer on this planet stupid??
Jan
Is every audio designer on this planet stupid??
Jan
Bimbla, search for Quad 405, 360, 520, 606, 909. These are amps without quescient current through the output stage.
No Vbe multiplier & Class-B
Gentleman,
It was just these points that caught my attention. I just decided to share it with you all.
The original article that I have posted points to the Equin amp published in Elektor (darn, again Class-B
) for details on how Transient Intermodulation Distortion is eliminated and how the output transistor topology helps (there is mention of Quad Triplets too!) making the crossover distortion inaudible.
Thanks!
Gentleman,
It was just these points that caught my attention. I just decided to share it with you all.
The original article that I have posted points to the Equin amp published in Elektor (darn, again Class-B
) for details on how Transient Intermodulation Distortion is eliminated and how the output transistor topology helps (there is mention of Quad Triplets too!) making the crossover distortion inaudible.Thanks!
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