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Why do I like Class AB better than Class A?

So I just purchased a Plinius SA 100 MKIII, and have had 2 listening sessions comparing both with the toggle switch. To me clearly the AB is more detailed and focused, the A is warm but a little fuzzy and bloated, although I would give it a slight nod on just vocal songs. Am I just not use to the sound as this is my first A amp or have I not let it properly warm up for class A (1hour or so).
Don't get me wrong, i love the amp, great bottom end slam but I don't hear the holy grail from Class A. Thanks in advance for the input guys.
barfbag

Showing 2 responses by elizabeth

elizabeth
6,726 posts
 
Even when in class 'AB' the lower level signal is class A.. up to a point.
And many pure class "A" are also only class A up to a point.
As mentioned it is just a bias voltage, and can be in a wide range..

Pure class "A" are just like small nuclear reactors as far as heat goes....
elizabeth
6,726 posts
 
My prior amp, a Forte 4a was class "A" and sounded best only if left on 24/7. It took a few hours to sound decent, and to really shine took at least 24 hours..

It was only 50 watts a side, but it was like a little room heater.
My current amp, much bigger Bryston 4B-SST2 produces half the heat in a mass twice as big. (with six times the wattage) and I leave that on 24/7 too.
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