I agree with Rich3549. Class A amplifiers are biased up to the point were the output devices are running full tilt all the time. Class A designs use more current and require large heatsinks to dissapate the heat. Not a very efficient design but do generally sound sonically better than class A/B. Class A/B amplifiers are the dead opposite & the bias is set to a predetermined setting where as the output devices runs cooler until called upon for higher volume levels. Class A amps have a tendancy to wear themselves out faster than class A/B amps(eventually requiring replacement of output transisters & caps). Note some class A/B amps are biased up a bit to give you the first 25 watts in class A. The MF 2300A is a superb class A/B amp and at 1100 US is a very reasonable asking price.
