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Discussion in 'Archived Threads 2001-2004' started by Kevin. W, Mar 10, 2002.
I'm just curious to whats the difference between a Class A and Class AB amps. Thanks
In class A, the output devices run all the time (360 degrees). They draw full power all the time and run VERY VERY hot. Hence, they are usually hideously expensive and low powered.
Class B runs 2 devices at 180 degrees each (ie, half). More efficient, but when they switch from one to the other crossover distortion results.
Most amps are AB, which is inbetween. Devices typically run 190+ degrees.
Peter neglected to add that Class A amplifiers sound incredible and that is their allure.
A lot of SS amps nowadays run in Class A/B, meaning that they are running full Class A up to a certain wattage (10 watts or so) and then they switch over to Class B operation.