Those are all excellent answers but if you want to know how they sound different, visit a Plinius dealer as some of them are switchable between class A and A/B.
Even 25 watts of class A will run quite warm. If you want to check if your amp is class A, rig up an ammeter onto the power. While playing music at increasing volumes, when the dial/readout starts to oscillate, that's when it kicks into A/B. For that 25 watts, that would be 0.25 amps and that's loud.
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